What is the best hard drive?

http://www.backblaze.com/blog/best-hard-drive

by tolien • 12 years ago

446 140 12 years ago

mmastrac• 12 years ago

Always love reading HDD reliability stats from Backblaze -- but this demonstrates one of the reasons why post dating is so important, especially when the information in the post is time-sensitive. Nowhere on the page does it say that the post date is today, unless you click the "latest posts" tab by the author below.

I had originally though it was a repost of the many older articles from Backblaze until seeing a reference to Dec 31 2014. While not terribly ambiguous now, the ambiguity will only grow as the year marches on.

If someone from Backblaze happens to see this: you don't need to put it in your URL, but please date your post near the top or bottom of the text.

atYevP15• 12 years ago

Yev from Backblaze here -> it's an internal debate as to whether we should put dates on everything. It used to be that they were part of the URL (because of the way our blog was designed) but that is no longer the case. We decided to leave them off for a while to see if that made posts more "evergreen", but we definitely see where it can lead to some confusion. We'll keep chatting about it internally, there's likely a good middle-ground.

_delirium• 12 years ago

I'm not sure if it's been edited, but the current post seems fine to me. It doesn't have a date on the post per se, but it's very clear up front when the data is from: the table is labeled "Failure Rates Through December 31, 2014" in bold in the table header, which leaves little room for confusion.

sliverstorm• 12 years ago

They aren't "evergreen" by nature though, right? Many of the models you list will probably be gone in a handful of years, and the reliability numbers on different companies and different disk sizes could have done a complete 180. Why, just contrast the great numbers out of Hitachi with the Hitachi DeathStar of old...

richardwigley• 12 years ago

Evergreen, now there's a euphemism. :-)

I appreciate, in the end you have to do what gets you the most views, however, from my perspective missing out the date means you prefer to waste my time as I have to scan the article until I get a feel for how old it is.

I would read anything written within 6 months and would consider up to 12 months if the information was high quality. It's not like we're overburdened with quality, independent, information.

If your going to be business minded, why not have the date on for the first few months and remove it when the first flush of green has gone. ;-)

rootbear2• 12 years ago

As a general rule, I get really annoyed when I come across a web page and I can't tell how old it is, especially if it is information that is likely to age rapidly. I don't care if putting a date on the page makes it less "evergreen", hurts someones SEO stats or makes the flowers wilt, I just want to know if I can trust what I'm reading.

redorb• 12 years ago

Perhaps a good middle ground is to add a date to these types of posts - but put the date in a image - so its user readable but most likely skipped by search engines

WoodenChair• 12 years ago

You definitely should put a date on everything. Without a date, your post loses much of its context: http://www.observationalhazard.com/2014/09/put-date-on-your-...

atYevP15• 12 years ago

BREAKING NEWS -> There are now dates on all of the individual blog posts. The landing page is "date-free" but is in chronological order, if you open a post, the date will be below the title...AS NATURE INTENDED!

brokentone• 12 years ago

This (and I'd argue most tech posts) is not at all evergreen content though.

rasz_pl2• 12 years ago

hey Yev, how about something secure like TLS 1.2 on the blog? RC4 and 3DES are great if you are playing hackme's at defcon to let people break your 'secure' connections on the fly using laptop GPUs, but not on supposedly Secure Cloud Storage company blog.

ttty• 12 years ago

You could do:

- Show last update date on all posts; - The evergreen posts you just update every 3-6 months to keep them updated and still green; - The not evergreen posts can be considered not useful therefore let them be old.

sjs• 12 years ago

Please put dates on things that are published. It can be important information for readers. Leaving off dates is frustrating and doesn't make the content any fresher in any way.

bootload• 12 years ago

"... Yev from Backblaze here -> it's an internal debate as to whether we should put dates on everything. ..."

@Yev, writing about specific technology is time-bound and doesn't exactly have the half life of DNA.

Having said that, I appreciate all that Backblaze writes about hardware. It's interesting and easy to read. This takes time and thought, you (at Backblaze) must be doing something right.

keerthiko• 12 years ago

One of my preferred middle-grounds (what I use for my own writing) is to add a "Last updated: <date>" at the bottom or in faded font at the top of my posts. This way the information is there, and useful, but that doesn't mean the post cannot still be relevant today.

Sir_Substance• 12 years ago

Websites don't go yellow as they get older, and it's really common for data from 10 years ago to seamlessly update so it looks like it was posted yesterday.

If you don't date your articles, they're of casual interest only, because I can't be sure they're current enough to use them as the basis for decisions.

unreal37• 12 years ago

Is it only because they did a similar post last year that you were confused? Maybe this just needs "2015" in the title?

Timshel• 12 years ago

They recently did an article on 6TB drives. My first thought was that it could be misnamed repost and I started by searching for a date.

kbenson• 12 years ago

Unless they just added the date all over the first couple of paragraphs, the content itself is very clear immediately as to exactly what time period it conforms to, and is not hard to see at all.

atYevP15• 12 years ago

Important News Bulletin -> Dates are now back on the individual blog posts!

wanderingstan• 12 years ago

It would be cool to have a browser plugin that could overlay the posting date onto a page. The approximate post date should be inferable from archive.org or Google cache.

deanclatworthy2• 12 years ago

Hopefully the end-goal of all these posts and pages is somewhat real-time (maybe updated daily or weekly) data on hard drive reliability. Then the blog posts just serve as a layman's write-up of the interpretation of the data.

ewams• 12 years ago

It is just under the title at the top of the article: " What is the Best Hard Drive? January 21st, 2015 "

notacoward2• 12 years ago

Dup of https://news.ycombinator.com/item?id=8922996 submitted almost two hours earlier.

ciupicri• 12 years ago

You've posted a broken URL: "Post not available".

notacoward2• 12 years ago

I guess I have Backblaze to thank for that. It was a valid URL when I posted it. sigh

btown• 12 years ago

Does anyone know if HGST's 1TB hard drives follow this reliability trend?

kw713• 12 years ago

7K1000's are fantastic in my experience

valarauca1• 12 years ago

I can't load this site because blackblaze only supports 2 TLS ciphers. TLS_RSA_WITH_RC4_128_SHA, TLS_RSA_WITH_3DES_EDE_CBC_SHA

cbhl• 12 years ago

Have you tried using Google Chrome?

rockdoe• 12 years ago

I think his point is that neither of those are secure.

rasz_pl2• 12 years ago

https://www.ssllabs.com/ssltest/analyze.html?d=https%3A%2F%2...

RC4 and 3DES, top of the line secure Cloud storage service indeed.

I browse with old insecure ciphers disabled, and I seem to remember having no problem reading backblaze blog before, either they downgraded their security (Occulus rifts website used to downgrade to rc4 whenever you wanted to pay them any money, but that was before FB buyout), or I disabled rc4 later than I thought.

darkarmani• 12 years ago

Those are old ciphers, so they should be easy to enable in your browser.

kw713• 12 years ago

I've been listening to the discussions of data recovery technicians for many years. As such, I took a guess at the results before the page loaded.

And I was right. Seagate bad. Hitachi best. WD almost as reliable as Hitachi.

I can recall one or two bad WD models over recent years, the one at the top of my memory is the 500GByte WD5000AAKS. There was a flaw in the WD10EACS that made it park too frequently, but at least it had a parking ramp.

Hitachi has been a good vendor since the "deathstar" glass platter fiasco blew over. Now: Deskstar 7K's forever!

On the other hand, Seagate seems to ship flaw after flaw. Lately they tend to have spindle bearings that die if the drive gets bumped. If that doesn't happen, surely a head will go bad.

jacquesm• 12 years ago

And they put out a ridiculous amount of heat too. I found a one that was too hot to touch in a 24 drive array which heated up the drives adjacent to the point that they too refused to work. So what looked like an extremely unlikely double drive failure ended up being only one.

xienze• 12 years ago

It's funny how things can turn around so completely. Around the time of the Deathstar fiasco, you couldn't pay me to use a Hitachi. Seagate was the brand to buy. Now it's the complete opposite.

gtaylor• 12 years ago

I still cringe a little bit when I see "Deskstar", but apparently they've turned it around in a big way. I'm still irrationally scared, though.

thaumaturgy2• 12 years ago

I'm going to be mad forever at WD for pioneering the approach to distributing drive firmware & tuning parameters over both stripe 0 and the drive's on-board ROM, making board swaps impossible for small shops.

But I'm really disappointed at what's happened to Seagate. I've gone from total confidence in recommending their products to actively recommending against the brand in just a couple of years, and our experiences roughly match Backblaze's. (Though on a much much smaller scale.)

kw713• 12 years ago

In the older days some of these disks had a discrete rom for this, but recently they have been integrated into a larger chip. It seems that if you have the rework skills, you can transfer the chip with integrated memory to the new board. It's certainly gross when the spindle motor driver on one of these boards explodes.

However if you take the lid off a WD drive, the head arm pivot goes out of alignment, since it is secured in place by one of the lid screws. So, if you have to swap internal parts for data recovery, you should own or make a jig to hold the top of the pivot and make fine adjustments, or you will never be successful. Depending on your skills, this may present more difficulty than reworking a board for a swap.

Luckily I have never had to try a DIY data recovery.

techrat• 12 years ago

Seagate started tanking, not surprisingly, shortly after they acquired Maxtor. Generally the last good stretch of Seagate drives was just before 750GB was the top size.

When the drives started reaching 1TB capacity... There were models where they started throwing Seagate branded drives into Maxtor external cases... And that was when it all went to shit. The infamous 7200.11 series.

Dealing with the 7200.11 drives was like the capacitor plague. They seemed to work well long enough to get other people to buy loads... then the firmware problems... then the sudden head crash problems... then the sudden won't power up anymore after a reboot problems...

All the same kind of shit that people saw with Maxtor post 2GB that caused people to stop using those drives en masse. Those old 2GB Maxtor drives were reliable as fuck, though.

I'd normally end something like this with a bit about how history repeats itself and I fear for the next drive company that will get bought out by Seagate, but when you look at it... We're down to two with a small smattering of subsidiaries that no one can really be sure are rebrands or proper made drives.

Case in point. Hitachi is owned by WD and Samsung HD is owned by Seagate now. Toshiba owns some WD assets and bought out Fujitsu's HD division. Beyond that, not much left.

caycep• 12 years ago

In fairness to Hitachi, the "Deathstar" was developed on IBM's watch, no?

kasabali• 12 years ago

There was a flaw in the WD10EACS that made it park too frequently,

I don't know that specific model but frequent parking is not a bug, it's a (highly annoying) feature of (most?) 2.5" and green 3.5"WD drives for some years.

moe• 12 years ago

While I love these recurring blog posts, it would be even nicer if Backblaze could wrap a public API and/or pretty interface around their live monitoring.

I'd happily pay a small fee for access to an up-to-date snapshot when I'm in the market for harddrives.

atYevP15• 12 years ago

Yev from Backblaze here -> Not a bad idea, though that might take a lot of work on our end. In the mean time, we're going to be releasing some raw data in the coming weeks, so stay tuned for that!

userbinator2• 12 years ago

The Seagate Barracuda 7200.14 3 TB drives are another story. We’ll cover how we handled their failure rates in a future blog post.

I'm really looking forward to this... could it be a similar problem to the one that caused the huge amount of 7200.11 failures a few years ago?

spydum• 12 years ago

agreed. I think I had around 7 different barracuda 7200's.. not a single one remains operable, all failed, though they did survive >1yr, they just didn't have the longevity of WD's or Hitachi's which ran on the same infra (and in most cases, continue to run).

wiredfool• 12 years ago

I've got a sample size of 1 on those things. Glad it's not more, cause it made for an unhappy thanksgiving time when it failed.

fuzzix• 12 years ago

I have five Seagate branded 3TB external disks, so have no real idea what's inside.

Three of them are dead. I stopped using the others.

shampine2• 12 years ago

Are you referring to the botched firmware ones (I think the firmware revision was SD15)?

If so, at the time (~2008) I had an HTPC with 10 1TB-1.5TB drives with 6 of 10 affected by the firmware issues. I was able to successfully flash all my drives at the time with no data loss.

onethree• 12 years ago

i built a pc for a family friend around that time... i'd spec'd it with a different drive, but they showed it to the IT guy at their work who recommended seagate. 6 months later the drive stopped working, and it had to be shipped to the other side of the world to be reflashed

barrkel• 12 years ago

One failure from one drive bought for me too.

Freaky• 12 years ago

Probably just more sensitive to vibration in long term use. 40% AFR in normal conditions would be insane, and I doubt we'd need Backblaze to point it out.

I have six ST3000DM001's and seven ST31500341AS's, all with about 2 years on the clock (~20,000 power-on hours). With 40% and 25% AFR's respectively, the odds of all thirteen surviving are:

1 / ((0.6 12) * (0.75 14)) = 1 in 25,782.

I doubt I'm that lucky.

udev• 12 years ago

Looks like Seagate drives are at a very good price point for them, enough to compensate for the higher failure rates.

It looks like Blackblaze managed to build a system with good fault tolerance, such that they can control the $-price/failure-rate ratio as they need.

In summary: - HGST, good - WD, expensive (in bulk) - Seagate, we buy them despite failures

adad95• 12 years ago

Hum... I think this explain my one dying drive at home. (4 Seagate drives)

dragontamer4• 12 years ago

I love the data, but I'm a little mad that Hitachi had to die as a company and got sold into pieces.

I'm not sure if I trust what you guys did, calling the old Hitachi Drives as HGST. Technically, the 3.5" drives from Hitachi got sold to Toshiba.

For example, the Toshiba DT01ACA300 is allegedly the same design as the Hitachi 7k3000.

In the following link, note that the "HDS723030BLE640" is the model number to the 7k3000 with ridiculously low failure rates in the Backblaze study.

http://goughlui.com/2013/02/26/toshiba-dt01aca300-aka-hitach...

I don't know if HGST drives are related to the old Hitachi models at all.

Again, I hate to criticize such awesome research that you've given away for free in your blog. But I'd definitely would like some research and clarification on the Hitachi -> Toshiba or Hitachi -> HGST situation.

RickHull• 12 years ago

I'm not sure if I trust what you guys did, calling the old Hitachi Drives as HGST.
I don't know if HGST drives are related to the old Hitachi models at all.

FTA:

Some of the HGST drives listed were manufactured under their previous brand, Hitachi. We’ve been asked to use the HGST name and we have honored that request.

dragontamer4• 12 years ago

I do realize that is what was asked of them. But that doesn't necessarily mean that was the correct way to go about it.

The Serial Number / Model Number information on the other hand should work if enough details are provided.

pbhjpbhj2• 12 years ago

We’ve been asked to use the HGST name and we have honored that request. //

Intriguing - that suggests some sort of advertising deal? Which calls in to question the impartiality of the report.

Who asked them? In what context? Why accede to a third parties interference in the report?

Are Backblaze getting reduced price HGST drives now?

brianwski3• 12 years ago

Backblaze employee here - we're also going to release the raw data in a few weeks, which I believe will have every last drive serial number (that uniquely identifies the hard drive in the universe) plus a metric ton of other stuff, so hopefully you can mine that for the info you want.

chdir• 12 years ago

The winner of this post, HGST (formerly Hitachi Global Storage Technologies) is a wholly owned subsidiary of Western Digital. Their NAS are well rated on Amazon & Newegg.

Personally, I'm more concerned about the lifetime of laptop HDD (500GB range). Wonder what's the time frame around which I should swap it out (& what brand)

seanp2k2• 12 years ago

Given that you can get 512GB M2 SSDs now, I'd say go for that if you're worried about reliability. From what I've read, SSDs are more reliable unless you're trying very hard to wear out their endurance (on the order of 2PB according to http://techreport.com/review/27436/the-ssd-endurance-experim... )

pjc50• 12 years ago

SSDs also have a wide variance in failure rates by model, the highest I've heard is 8%.

penguat2• 12 years ago

but there can be some interesting not-a-failure modes, I know because I suffered one and the recovery was a nightmare due to overly-protective UEFI. Fortunately, anything on my local SSD is only in cache and not to be worried about ;) (and I managed to put the UEFI in dumb mode so it wouldn't interfere)

Gurkenmaster• 12 years ago

Early SSDs used to die quickly from power failures but then the manufacturers improved them by using better capacitors.

joshstrange3• 12 years ago

Let me start off by saying I am a Backblaze customer and I LOVE these posts and use them as my bible for buying drives for my NAS/Media Server.

With that said this is going to sound a little nitpicky but why isn't the publication date anywhere on this article? I've noticed a growing number of blogs not putting the publish date anywhere on the blog page which makes it really hard to know if what they say is still valid. In this case you can infer from the dates of the drives they tested that it was published in 2015 but a number of blogs don't have those clues in the blog to let you know when it was posted. Normally you can look at the URL to see the date but BB uses slugs off /blog/ so you can't get the date from there either.

brianwski3• 12 years ago

Backblaze engineer here, the blog folks are trying to fix it right now. I also hate "evergreen" blog posts that don't include a date, I wasn't aware we were doing that. :-(

joshstrange3• 12 years ago

Thanks! You guys rock, I love your posts and product.

atYevP15• 12 years ago

Backblaze blog folk here -> change is hard :-(

atYevP15• 12 years ago

Important New Bulletin -> There are now dates on the individual blog posts.

pippy• 12 years ago

I'm feeling foolish for not reading it and purchasing four Seagate Barracuda 7200.14s.

I had no failures so far but with a 50% failure rate it's bound to happen soon

joshstrange3• 12 years ago

As someone with 8x3TB Seagate's I feel your pain. My new build will only use 4TB+ Seagate's or HGST (But they are pricey).

cjensen• 12 years ago

Love and appreciate that Backblaze presents this data, but there are some obvious issues: comparing the annual failure rate of a pool where avg. age is 1 year to a pool where avg. age is 3 years isn't a great comparison.

Rather than annual rates, I'd really prefer to see failure rate after six months, one year, two years, etc. This would make it easier to answer questions like "was drive X always bad? Or just when new? Or just when old?"

brianwski3• 12 years ago

Backblaze employee here - we're going to release the raw data in a couple weeks, so everybody can do their own analysis.

deanclatworthy2• 12 years ago

Can't wait for this, but it'd be great if you considered having "real-time"-ish data feed for everyone to hook into. Then we don't have to wait for the annual blog post ;-)

joering2• 12 years ago

I think there has never been more personal piece of technology than your full of important data hard drive, especially pre-cloud era, when now people just don't worry much of a dying hardware.

But back in the ole' days, every one of us have lost very personal data due to hardware failure at some point. And it's interesting how the opinion about brands are being formed.

For example, my first drive that died was Seagate. Surprise surprise my opinion about said company is very low now. But in most part, it's very bias opinion, especially given the fact I have never owned another Seagate for the reason of crash. I love WD and never had one failed, currently about 20 full of data. But I met bunch of folks who hate WD and had them crush and they lost important data. And they love Seagate.

It's interesting how opinions about hard drives are being formed throughout our lives.

schneider_sh• 12 years ago

I had the opposite issue. Bought WD Black for my first PC build. It died within ~3 weeks. Bought another to replace it. Again dead within a month. Have about 8 Seagate drives now and have not had an issue at all. Will avoid WD at all costs now.

tracker1• 12 years ago

Interesting, I built a home FreeNAS a few years ago, with Seagate 3TB drives, 7200.12 iirc, and saw 3 of them (out of 12) fail well under 2 years... at this point, I've had so many issues, it's pretty much sitting there. I put 4x4tb WD reds into my older Synology NAS and have been using that without issue.

ck2• 12 years ago

It's a shame single platter 1TB drives were not in that test.

I bet they are the most reliable because of single platter.

Shivetya• 12 years ago

so on a given day, or by week, how many drives do you replace?

DanBC• 12 years ago

Is there any idea which drives were shucked or not shucked from external enclosures?

Norp• 12 years ago

This sums up my experience with Seagate. I bought my first Barracuda 3TB two months ago, it died out 20 days later with the notorious two-click sound.

I can't even be bothered to push warranty for replacement, terrible. Sticking with WD from now on.

icodestuff• 12 years ago

Oof. I've got a NAS with 4 3TB Seagate Barracudas, same model number as the drives with the 46% failure rate. One's already failed, and I replaced it with the same model drive.

Anyone have a recommendation for how to replace all the drives with more reliable models without wrecking the RAID? Downtime is okay, but I don't have spare space for the contents to make a giant backup. It's currently set up as a "Synology Hybrid RAID" that looks an awful lot like a RAID 5.

wazoox• 12 years ago

HGST drives are slightly larger than Seagate of the same advertised capacity. Replacing Seagate drives with HGST ones is therefore easy, while it's often impossible the other way around (fortunately :)

switch007• 12 years ago

Without a backup, you need a temporary, identical NAS device with the 4 new disks. Then do a file-level copy. Then put the 4 new disks in the old NAS and import the array. Do you know of a store with a very lenient returns policy?

An online capacity expansion (replacing one at a time) will mean a very long time in a degraded state, possible multiple disk failures, increased chances of data loss (power goes off, etc)

Rapzid2• 12 years ago

If the NAS uses linux RAID you just need drives that are AS LARGE or LARGER than the current drives. Precisely, not what's marked on the box. If you want to be on the super safe side and are uncertain, get somebody to help you DD(or dcfldd) each old drive onto a new drive and then just pop the whole new set into the NAS and let it rip.

It would also be a good idea to check the NAS vendors forums.

ValentineC• 12 years ago

Are you looking to replace all 4 disks at once?

If you have a spare PC lying around, check out the XPenology forums [1] for the software (specifically, NanoBoot or XPEnoboot) required to create your own Synology clone.

You'll be able to create a new SHR volume with new disks. As suggested in another post, do a file level copy to the new volume. You should then be able to replace all the disks in your actual Synology NAS with your new disks at once, and perform a migration [2] so everything works with your Synology hardware.

(This is possibly a better solution than replacing the disks one by one, since there's the risk of another disk failing while the RAID is being rebuilt.)

[1] http://xpenology.com/forum/viewforum.php?f=2

[2] https://www.synology.com/en-us/knowledgebase/tutorials/484

robk• 12 years ago

How full is your NAS? If you're not that full and your data could fit on one non-RAID hard drive, you can add a 4th drive as a second disk group, copy folders manually in Diskstation to the 4th drive, then pull the other three, create a new 3-disk disk group there, copy back once that's built, then wipe the 4th and add that. That's convoluted but for me was the easiest and most reliable way. With the RAID max_speed tweaks, it was all done in about 72 hours end to end.

chuckkir• 12 years ago

The Western Digital Velociraptor is pretty tough to beat. Near SSD performance (depending on what you are doing) and reliable. For compiling code it's definitely the best choice.

penguat2• 12 years ago

Unless you could use an SSD? (most people who compile code are valuable enough that their time warrants the fastest thing available, no?)

alimoeeny• 12 years ago

Is "compiling code" an IO intensive (IO bound) task?

TillE• 12 years ago

It certainly can be. Theoretically your OS should be pretty good about caching files in memory, but in practice I've measured significant differences when compiling large C++ projects on a fast SSD.

hga• 12 years ago

Ehh; not yet trusting SSDs (or back in 2011 when I did my last computer builds), I prefer 15,000 RPM SAS enterprise drives. 50% greater rotational speed, SAS should be faster than SATA, and even Seagate (true) enterprise disks should be more reliable than WD consumer grade disks.

Now/next time I'll seriously consider SSDs.

fivedogit• 12 years ago

This same URL was submitted an hour earlier and got 4 upvotes. This one has 222 as I write this.

https://news.ycombinator.com/item?id=8923016

Timing is everything, I guess.

atYevP15• 12 years ago

Much like comedy!

zkhalique• 12 years ago

The top two rows seem to be contradictory. How can you have a smaller annual failure rate AND a smaller average age?

  Name/Model	    Size    	Number of Drives 	Average Age in years	Annual Failure Rate	95% Confidence Interval
  HGST Deskstar 7K2000
  (HDS722020ALA330)	2.0 TB	4,641	3.9	1.1%	0.8% – 1.4%
  HGST Deskstar 5K3000
  (HDS5C3030ALA630)	3.0 TB	4,595	2.6	0.6%	0.4% – 0.9%

sib• 12 years ago

Reading the model numbers and sizes, the top row is 2TB drives, the second row is 3TB; the 3TB were launched more recently. So, they have a smaller average age. And, apparently, they also fail at a lower rate.

HNaTTY• 12 years ago

I'm super excited for the new Seagate 8tb drives @$260/each.

Please order a carton of them and let us know ASAP how they work for you!

sukumargv• 12 years ago

The data is not accurate. The stats are literal numbers, Which means these guys are not mentioning how many hard drives each vendor sold. But instead they are just comparing the Faulty drives numbers. If you consider the number of HGST and Seagate pieces sold then only these stats or demographics can be considered reasonable.

Punchline: This review or analysis could be biased.

pierrec• 12 years ago

They're not just comparing the faulty drives numbers. Maybe you misunderstood the way they presented the data: in the first table, the "Number of Drives" column refers to the total number of drives they studied for each model, not just the ones that failed. So they give the sample size and the rate of failure for each model.

Or are you saying that the difference in worldwide sales for each drive model somehow renders Backblaze's failure rates invalid? The size of the population is irrelevant unless the size of the sample exceeds a few percent of the total population you are examining.

smackfu• 12 years ago

By definition, it's going to be a true analysis of the drives when obtained the way Backblaze obtains them and when used in the environment Backblaze uses them. Both of those may be different from Joe Random consumer.

agumonkey• 12 years ago

I'll try to find the URL again, but in the mean time, I've read a comment on a thread from a veteran technician saying that hard drives failures were mostly due to heat fluctuations (material expansion) and that without this information, failure rates were not valuable enough.

What is the best hard drive?

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