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Old 2010-04-22, 06:40   #12
retina
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Quote:
Originally Posted by joblack View Post
With the Samsung 1TB 7.200 RPM you're fine. All harddisks bigger than 1 G have (at least at the moment) a larger risk of failing.
Well since all HDDs currently are "bigger than 1 G", then you mean that all HDDs have a larger risk of failing ... than what?

And if you mean 1TB, then I would like to see some figures please. How much larger risk? 0.1%? 100%?
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Old 2010-04-22, 08:44   #13
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Here is a test of 9 different 2 Tb harddisks:

http://hothardware.com/Articles/Defi...Drive-Roundup/
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Old 2010-04-23, 01:41   #14
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Quote:
Originally Posted by retina View Post
Well since all HDDs currently are "bigger than 1 G", then you mean that all HDDs have a larger risk of failing ... than what?

And if you mean 1TB, then I would like to see some figures please. How much larger risk? 0.1%? 100%?
I'm a great fan of Samsung Disks. I own Samsung HDs since they released the 160 GB model. My computer is always on so I can estimate that a harddisk will fail after 3 - 3.5 years.

At the moment I'm running 1 TB Samsung harddisks and they are fine. I have a friend who owns a PC shop and he said most of the warranty cases are 1.5 or 2 TB harddisks.

I suggest you to get the 1 TB 7.200 Samsung harddisk and add it to a Raid 1 or 5 and you will be fine.

No percentage numbers available but the experience told me so ;) ...

Last fiddled with by joblack on 2010-04-23 at 01:43
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Old 2010-04-23, 02:13   #15
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Quote:
Originally Posted by joblack View Post
I have a friend who owns a PC shop and he said most of the warranty cases are 1.5 or 2 TB harddisks.
"Most" means what? 50.01%? And how does it compare on a ratio basis? Could it be that 75%, say, of all HDDs sold are >1TB, and account for, say, 75% of claims? Is that a likely scenario? And what is that sample size, 10 units? 1000?
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Old 2010-04-23, 03:21   #16
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Quote:
Originally Posted by retina View Post
"Most" means what? 50.01%? And how does it compare on a ratio basis? Could it be that 75%, say, of all HDDs sold are >1TB, and account for, say, 75% of claims? Is that a likely scenario? And what is that sample size, 10 units? 1000?
The most sold harddisk (most space for the buck) is a 1 TB harddisk so I assume these harddisks are the 'standard'.

Anyway my friend hasn't done a stastistical scientific paper on the return ratio so you (don't) have to rely on his personal statement.

Be careful with the biggest models ...http://www.qtl.co.il/img/copy.pnghttp://www.qtl.co.il/img/trans.png

Last fiddled with by joblack on 2010-04-23 at 03:25
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Old 2010-04-23, 20:34   #17
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2TB Hitachi drive here for $115

http://slickdeals.net/permadeal/3329...cache-sata-3.5

I bought my last 2TB Western Digital from mwave.
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Old 2010-04-23, 22:22   #18
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I buy 95% of my computer equipment from mwave, and have been a customer for almost 10 years now. Their prices are consistently among the lowest on the web, and the few times I've had problems, their customer service has been top-notch.

(Also one of the few companies online that don't gouge us Alaskans on shipping prices.)
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Old 2010-04-25, 10:57   #19
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Quote:
Originally Posted by enderak View Post
3 1TB drives in RAID 5 will get you 2 TB of storage
I've always felt disdain for three unit RAID 5 arrays (the bare minimum and least efficient of RAID 5 setups). RAID 5 is slow unless you have good XOR hardware. And, RAID 5 is most suitable for long, sequential access, whereas *most* desktop storage needs tend toward random access.

Striping a pair of drives will get your 2 TB and run much faster. Backup to another pair.

Splurge for a fourth drive and do RAID 1+0 if you want redundancy. It will be miles faster than the RAID 5 setup, and faster than a pair of 2 TB drives in a mirror.

Quote:
Originally Posted by retina View Post
RAID is an availability solution, not a backup/protection solution. If one drive dies you are back to no "protection"
I disagree unless you are dealing with a read-only volume. If you lose redundancy, then the remaining in-tact volume serves as a backup for the incremental data that otherwise would be certainly lost if one had to restore from an off line backup.

This argument degenerates to "your off line backup is an availability solution only, because if your online storage fails you are back to no protection" -- and this, of course, applies to your 3rd and 4th line backups as well. Thus, providing a backup is impossible (which is actually mathematically true*, so I digress).

* Number of backups, n, needed to achieve a "true" backup for y years:

r^n = 0

where, r is rate of failure of one backup copy over y years

(Hint: n = infinity)

Last fiddled with by Freightyard on 2010-04-25 at 10:58
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Old 2010-04-26, 15:03   #20
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Quote:
Originally Posted by Freightyard View Post
I disagree unless you are dealing with a read-only volume. If you lose redundancy, then the remaining in-tact volume serves as a backup for the incremental data that otherwise would be certainly lost if one had to restore from an off line backup.
Think about what happens if some malware1 erases all your data. The RAID5 setup will happily replicate the erased/corrupted data across all the storage media.

Now, where is my backup ...

1 Doesn't have to be malware of course. Can be any malfunctioning program. Or even a silly mistake by the user.
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Old 2010-04-27, 18:56   #21
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Quote:
Originally Posted by retina View Post
Doesn't have to be malware of course. Can be any malfunctioning program. Or even a silly mistake by the user.
Or a power failure that corrupts the volume. Sure, I agree, but it still seems obvious that RAID provides a level of backup. Never said it should REPLACE a backup, though.
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Old 2010-04-27, 21:33   #22
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I had truecrypt nuke a whole 3.2 TiB RAID-5 volume due to an improper shutdown, that wasn't fun. I let chkdsk run for about a week trying to fix it before giving up.

Took another week just to get everything back on it, curse you horrendously slow 100 Mbps networking.
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