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Unusual drive failure - 12v line short
I have a PVR thingywotsit on my TV. Today it died, no power. Listen to PSU - tick, tick, tick. Ah, thought I, bad caps. But no, the cause was the hard disk - the 12v line was completely short. I've not seen this mode of failure of a hard drive before now; has anyone else? Western Digital model WDC2500BB-00RDA0, 250GB. date on drive: 25 Jul 07, out of warranty Stuck in a 160GB IBM from my bits box and off we went. It may be relevant that the drive is on 24/7. I cannot find any specs for expected longevity or MTBF on wdc.com. -- (\__/) (='.'=) Bunny says Windows 7 is Vi$ta reloaded. (")_(") http://imgs.xkcd.com/comics/windows_7.png |
#2
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Unusual drive failure - 12v line short
But no, the cause was the hard disk - the 12v line was completely short. I've not seen this mode of failure of a hard drive before now; has anyone else? Maybe a capacitor across the 12V line died. RIP. |
#3
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Unusual drive failure - 12v line short
But no, the cause was the hard disk - the 12v line was completely short. I've not seen this mode of failure of a hard drive before now; has anyone else? Yes. Unusual, but it does happen. In this case, the extra current has just caused the PSU to trip out. Most times, there is enough spare capacity in the PSU to vaporise the part that's failed, and whatever device it is just power cycles and comes back with the disk dead. Cheers. |
#4
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Unusual drive failure - 12v line short
On Sun, 7 Jun 2009 16:17:44 +0100, Mike Tomlinson
wrote: I have a PVR thingywotsit on my TV. Today it died, no power. Listen to PSU - tick, tick, tick. Ah, thought I, bad caps. But no, the cause was the hard disk - the 12v line was completely short. I've not seen this mode of failure of a hard drive before now; has anyone else? Western Digital model WDC2500BB-00RDA0, 250GB. date on drive: 25 Jul 07, out of warranty Stuck in a 160GB IBM from my bits box and off we went. It may be relevant that the drive is on 24/7. I cannot find any specs for expected longevity or MTBF on wdc.com. Most modern drives (within last 5 years or so) have a very long expected lifetime (MTBF = 250,000 hrs = 28 years running 24/7, and 500+k hours is more typical today). You will most likely replace the drive within 5-7 years due to capacity (drive nearly full?--replacement drive costs $100 and is 5-10 times capacity--or more) or you might buy a new system with a new (larger) drive, OS, programs, etc. Also, the speed (read/write and/or transfer) of new drives (making backups of large files, etc) might be significantly faster, so you buy a replacement for that reason. Therefore, it is likely the drive will be replaced for a number of reasons other than it died. |
#5
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Unusual drive failure - 12v line short
Mike Tomlinson wrote:
I have a PVR thingywotsit on my TV. Today it died, no power. Listen to PSU - tick, tick, tick. Ah, thought I, bad caps. But no, the cause was the hard disk - the 12v line was completely short. I've not seen this mode of failure of a hard drive before now; has anyone else? Yes, usually due to a capacitor across that rail as a filter shorting. Not common, but not unheard of. Western Digital model WDC2500BB-00RDA0, 250GB. date on drive: 25 Jul 07, out of warranty Stuck in a 160GB IBM from my bits box and off we went. It may be relevant that the drive is on 24/7. Nope. They get used like that a lot. I cannot find any specs for expected longevity or MTBF on wdc.com. The specs are pretty sparse on there now but they are typically 250K hours on consumer drives like that. |
#6
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Unusual drive failure - 12v line short
In message , Ato_Zee
writes But no, the cause was the hard disk - the 12v line was completely short. I've not seen this mode of failure of a hard drive before now; has anyone else? Maybe a capacitor across the 12V line died. RIP. More likely to be a transorb but most likely to be the motor driver IC. -- Clint Sharp |
#7
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Unusual drive failure - 12v line short
In comp.sys.ibm.pc.hardware.storage Ato_Zee wrote:
But no, the cause was the hard disk - the 12v line was completely short. I've not seen this mode of failure of a hard drive before now; has anyone else? Maybe a capacitor across the 12V line died. RIP. Had a Dell laptop with that problem; capacitor across the 19vdc power input shorted, so capacitors do fail that way. Jerry |
#8
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Unusual drive failure - 12v line short
On Sun, 7 Jun 2009 16:17:44 +0100, Mike Tomlinson
put finger to keyboard and composed: I have a PVR thingywotsit on my TV. Today it died, no power. Listen to PSU - tick, tick, tick. Ah, thought I, bad caps. But no, the cause was the hard disk - the 12v line was completely short. I've not seen this mode of failure of a hard drive before now; has anyone else? It's common enough. There will probably be two TVS (transient voltage suppression) diodes, one across the +5V rail, the other across the +12V. You can remove the shorted diode and the drive should work without it. Just make sure your power supply is good ... - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
#9
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Unusual drive failure - 12v line short
In article ,
Gerald Abrahamson wrote: : :Most modern drives (within last 5 years or so) have a very :long expected lifetime (MTBF = 250,000 hrs = 28 years :running 24/7, and 500+k hours is more typical today). The units for MTBF are not hours but device-hours, i.e., the product of the number of hours and the number of devices being observed, and that rating applies only during the device's rated service life, which is an entirely separate parameter. MTBF of 250,000 is almost totally unrelated to the expected service life. It is quite possible to have a device with its MTBF 250,000 and a rated service life of 1 hour. It just means that if you ran 250,000 of those devices for one hour you should expect 1 failure. Once a device passes its rated service life, the MTBF rating no longer applies. Think: a battery used to provide power to a missle's guidance system -- built to be highly reliable for the short time it's needed, and pretty much assured to go dead not long after that. High MTBF, short service life. Looking at the power-on hours and corresponding normalized SMART value on a few fairly recent drives, it appears that the SMART warning due to power-on hours would come at about 10 years of power on. -- Bob Nichols AT comcast.net I am "RNichols42" |
#10
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Unusual drive failure - 12v line short
In comp.sys.ibm.pc.hardware.storage Gerald Abrahamson wrote:
On Sun, 7 Jun 2009 16:17:44 +0100, Mike Tomlinson wrote: I have a PVR thingywotsit on my TV. Today it died, no power. Listen to PSU - tick, tick, tick. Ah, thought I, bad caps. But no, the cause was the hard disk - the 12v line was completely short. I've not seen this mode of failure of a hard drive before now; has anyone else? Western Digital model WDC2500BB-00RDA0, 250GB. date on drive: 25 Jul 07, out of warranty Stuck in a 160GB IBM from my bits box and off we went. It may be relevant that the drive is on 24/7. I cannot find any specs for expected longevity or MTBF on wdc.com. Most modern drives (within last 5 years or so) have a very long expected lifetime (MTBF = 250,000 hrs = 28 years running 24/7, and 500+k hours is more typical today). The MTFB is completely untelated to the device lifetime. It just describes the failure probablility during the device lifetime. Device lifetime is stated in the device datasheet and typically 5 years. For example, an MTBF of 250'000h gives you a failure probability of 365*24/250'000 = 3.5%/year, in the first 5 years. It dioes not make any statement about the failure pobability afterwards. Arno |
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