How long does hard drive last?

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Reliability Specifications
Non-recoverable Read Error 1 in 1014bits
MTBF (POH) 500,000 hours
Start/Stop Cycles 50,000
Component Design Life 5 years

So whoever wrote that samsung thing is wrong. It lifetime is only 43 000 hours.
 
Tsuniper-X said:
(From [Tsuniper-X])
Thanks for your replies people...but i still need a solid answer...

:

David Candy said:

"CDs last from 2 to 50 years. Make two (on different brands) and test every
two years. Shop bought CDs will last longer."

Then my obvious concern goes to my little PEHD.(Personal External Hard Drive)
How long does INTERNAL hard drives last? For EXTERNAL hard drives?

You got very solid answers. It depends. It could fail tomorrow, or be
going strong in 5 years. That is way a data protection system needs
multiple layers.
 
Tsuniper-Xwrote
David Candy said
"CDs last from 2 to 50 years. Make two (on different brands) an test every
two years. Shop bought CDs will last longer.

Then my obvious concern goes to my little PEHD.(Personal Externa Hard Drive
How long does INTERNAL hard drives last? For EXTERNAL hard drives

I don't believe a CD would last 50 years. That's what they said abou
VCR tapes as well. Blank CD's are made from the cheapest material, i
the cheapest manner possible

Hard drives? I have a rule about them, I don't trust them for m
mains after they reach two years old. This computer, while no
running 24/7, runs quite a bit

I have systems with 4 year old Western Digitals that are still runnin
strong. In fact, from around 30 drives in a Western Digital/ Maxto
mix. I've never had one go bad on it's own. I overheated one once
but it recovered

Hard drives are a very healthy lot
 
Alright, try this non MS newsgroup:

comp.sys.ibm.pc.hardware.storage

Some of them may prod, nitpick, ask you to think, beat you up, or simply
flame you. But, you'll understand more when the thread is done.

--
Lil' Dave
Beware the rule quoters, the corp mindset, the Borg
Else you will be absorbed
Tsuniper-X said:
(From [Tsuniper-X])
Well, i DID explain that PEHD stands for Personal External Hard Drive. If
you have Seagate 40GB PEHD, it would be awesome. Anyway, this PEHD is
USB-powered, so the device turns on as soon as i connect it to the computer,
obviously, while the computer is on. i use this PEHD mainly for data backup,
although i'm sick of sharing computer with my sister because of "my" way of
controling the computer.(Account settings, an ATTEMPT to assign a partition
as a personal drive for many people-you would know what this means if you go
to school, most school computer supports this method-, disabling
right-clicking, download permissions, etc.)

i have no pet, no elements(IDK why this subject had popped up), i live in
east coast of U.S., HOPEFULLY less than half a mile above sea level. i keep
my PEHD inside the box that kept PEHD until i bought it, like an egg-holder
that holds egg. i keep this box inside my closet until i have further NOTICE.
i format this PEHD quite often, because i THINK it's better than just
deleting the files, and i'm pretty worried about "abusive" formatting right
now.

The basic question is "What is the maximum time the hard drive can keep data
to itself?" i hate myself for not questioning in this way, but now i did
anyway. This question has been rising up after the realization of "CD's won't
last forever", which concerned my PEHD because that's the only backup system
i can...rely!

i now realize that i should have asked this question to computer hardware
manufacturers, but it's too late. i asked this to Newsgroup because i THINK i
have heard that the maximum time the hard drive can keep data to itself was
less than a day in about 30 years ago, and gradually increased with better
technology. The point of this question is "What keeps data?" i'm simply
looking for an ABSOLUTE backup system.


Shenan Stanley said:
Tsuniper-X said:
David Candy said:
"CDs last from 2 to 50 years. Make two (on different brands) and test
every two years. Shop bought CDs will last longer."

Then my obvious concern goes to my little PEHD.(Personal External
Hard Drive) How long does INTERNAL hard drives last? For EXTERNAL
hard drives?

Tsuniper-X said:
(From [Tsuniper-X])
Thanks for your replies people...but i still need a solid answer...

There is no "solid answer".

It's like you asking "How long will this rock last" and not giving any
further details.

- Are you sealing it in a vacuum bag, in a sealed metal safe encased in 6ft
of concrete?
- Are you putting it on the dash of your car?
- Will it be moved around?
- Will it be exposed to the elements - if so - what elements?
- Will you be touching it?
- Will anyone else be touching it - and how often?
- What elevation do you live at?
- Will you ever move?

Your "PEHD" (as you put it and never explained further - for example - is it
a static ram drive or one with moving platters?) will last as long as it
lasts in your environment given its level of use, exposure to different
situations, treatment and so on.
 
David

I was trying to point out that MTBF is misunderstood by many people. It
seems to mean different things to different people. As a way to judge the
quality of a particular brand of hard drive it is not useful as not all
manufacturers are talking the same language. It is easy to see why there is
confusion in the marketplace.

Kerry

"David Candy" <.> wrote in message
Reliability Specifications
Non-recoverable Read Error 1 in 1014bits
MTBF (POH) 500,000 hours
Start/Stop Cycles 50,000
Component Design Life 5 years

So whoever wrote that samsung thing is wrong. It lifetime is only 43 000
hours.
 
Kerry said:
David

I was trying to point out that MTBF is misunderstood by many people.
It seems to mean different things to different people. As a way to
judge the quality of a particular brand of hard drive it is not
useful as not all manufacturers are talking the same language. It is
easy to see why there is confusion in the marketplace.


There's a definition here, if you're interested:
http://foldoc.doc.ic.ac.uk/foldoc/foldoc.cgi?query=mtbf
 
David said:
Your basic premise is wrong. MTBF excludes failures on new items
(most) as QA will pull them. It also excludes failure from age as it
is irrelevent. It is a measure on how reliable a thing is during it's
lifetime.

So a hard drive is calculated thus

<testing - not counted><sale and use for next 5 years - counted><end
of lifetime of product - not counted>

If you want to measure average lifetime then measure that. MTBF
doesn't measure that (though it could - the maths is the same - but
it would be meaningless as a MTBF reliability figure).

MTBF lets Dell know they need x number of replacement drives in the
next year. As power on failures are generally excluded in MTBF and
failure rates
tend to be constant during the rated lifespan Dell can work out how
many will fail in a year (and all are less than 1 year old) and
include that in their prices and spare parts stock levels.

Kerry said:
Samsung says they calculate MTBF differently from your method:

http://www.samsung.com/Products/HardDiskDrive/whitepapers/WhitePaper_05.htm

They even mention an example:

"SAMSUNG's MTBF for HDDs is 500,000 hours. That means that if you
use your PC for 9 hours every day, your HDD should operate for
152 years. In imperfect, non-test conditions, however, please note that
the real life span of an HDD varies because of
fluctuating operating environments."

David said:
Reliability Specifications
Non-recoverable Read Error 1 in 1014bits
MTBF (POH) 500,000 hours
Start/Stop Cycles 50,000
Component Design Life 5 years

So whoever wrote that samsung thing is wrong. It lifetime is only 43,000
hours.

Kerry said:
I was trying to point out that MTBF is misunderstood by many people.
It seems to mean different things to different people. As a way to
judge the quality of a particular brand of hard drive it is not
useful as not all manufacturers are talking the same language. It is
easy to see why there is confusion in the marketplace.

There's a definition here, if you're interested:
http://foldoc.doc.ic.ac.uk/foldoc/foldoc.cgi?query=mtbf


More detailed definitions:
(The last one being the most recent article..)

Mean Time Between Failures (MTBF)
http://www.storagereview.com/guide2000/ref/hdd/perf/qual/specMTBF.html

Various definitions:
http://www.auditmypc.com/acronym/MTBF.asp

MTBF (Mean Time Between Flareups, er, Failures)
http://alumnus.caltech.edu/~rdv/comp-arch-storage/FAQ-2.12.html

Mean Time Between Failures (MTBF)
http://www.pcguide.com/ref/hdd/perf/qual/specMTBF-c.html

Seagate's Definitions:
http://www.seagate.com/support/glossary/

The newest article on the subject I could find:

MTBF: what lifespan can you expect?
http://www.techworld.com/opsys/features/index.cfm?featureid=1944&inkc=0
 

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