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UDMA CRC error count
I'm thinking of buying a used 1TB HDD as a backup for
non-critical data. On request, the owner has provided a health report by HD Tune. It has one line highlighted in yellow. The line is "Ultra DMA CRC Error Count". The values are : Current - 200, Worst - 200, Threshold - 0, Data - 2, Status - warning I know what DMA and CRC mean separately, but could anyone please explain the significance of the report? I've heard that this error is caused by a faulty cable (I'm assuming that this includes poor contact at the connector). Is that all it is - that a CRC error occurred twice in the past (probably due to the cable) and normally does not indicate any problem with the drive itself? AFAICT, there doesn't seem to be any other abnormalities. No reallocated sector, no spin retry. Some other values - Start/Stop count - 206 Power on hours - 181 TIA for any helpful input. |
#2
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UDMA CRC error count
Pimpom wrote:
I'm thinking of buying a used 1TB HDD as a backup for non-critical data. On request, the owner has provided a health report by HD Tune. It has one line highlighted in yellow. The line is "Ultra DMA CRC Error Count". The values are : Current - 200, Worst - 200, Threshold - 0, Data - 2, Status - warning I know what DMA and CRC mean separately, but could anyone please explain the significance of the report? I've heard that this error is caused by a faulty cable (I'm assuming that this includes poor contact at the connector). Is that all it is - that a CRC error occurred twice in the past (probably due to the cable) and normally does not indicate any problem with the drive itself? AFAICT, there doesn't seem to be any other abnormalities. No reallocated sector, no spin retry. Some other values - Start/Stop count - 206 Power on hours - 181 TIA for any helpful input. As far as I've been able to determine so far, that CRC counter doesn't get reset. And it's probably a count of cable errors. If the drive itself had a defective SATA interface chip, the counts could be caused by that, rather than a cable. So the statistic doesn't identify what was broken. Just that errors were detected. It could have been a defective cable, but there is no way to be sure. http://www.overclock.net/hard-drives...ror-count.html Paul |
#3
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UDMA CRC error count
Pimpom wrote: I'm thinking of buying a used 1TB HDD as a backup for non-critical data. On request, the owner has provided a health report by HD Tune. It has one line highlighted in yellow. The line is "Ultra DMA CRC Error Count". The values are : Current - 200, Worst - 200, Threshold - 0, Data - 2, Status - warning I know what DMA and CRC mean separately, but could anyone please explain the significance of the report? I've heard that this error is caused by a faulty cable (I'm assuming that this includes poor contact at the connector). Is that all it is - that a CRC error occurred twice in the past (probably due to the cable) and normally does not indicate any problem with the drive itself? AFAICT, there doesn't seem to be any other abnormalities. No reallocated sector, no spin retry. Some other values - Start/Stop count - 206 Power on hours - 181 My only personal experience with this involves: 1) An internal Samsung that was slightly bumped during operation (sitting horizontally, bumped on side). 1 UDMA error, no reallocated sectors. 2) an external vertical drive that fell on its side during operation. Lots of UDMA errors, and so many reallocated sectors that it always failed SMART testing right away. After the drive was completely overwritten, no visible defective or slow sectors were detected during scans with MHDD. I believe this drive is still in use as a backup. 3) Seagate, WD, Samsung, and Hitachi SATA drives plugged into a SATA- PATA converter based on a SunPlus chip. Each developed 1 UDMA error after being scanned with HDAT2 and the program locked up with an error that required reboot. No reallocated sectors. Apparently the new version of this SunPlus chip doesn't have that this defect. I've had lots of problems with SATA cables not being plugged in straight, but whenever that happened the drive wasn't recognized at all. You can avoid that by using SATA data cables with metal clips on their sockets, and Meritline.com often offers them for under $1, delivered, when they run a coupon deal (coupon usually expires within the first 3 hours after they open). If you're buying used drives locally, try to test them with MHDD (self boots from CD or USB stick) because when indicates what sectors are marginal and require multiple attempts to read them. Apparently some manufacturers considered it normal if a sector requires a dozen retries to read because each such brand new drive still passed its factory diagnostics. A full scan of a 1TB drive takes roughly 3 hours, much more if it's connected through USB 2.0. There's a Windows version of MHDD, called HDDscan, but it's a lot more likely to report slow sectors, probably because of stalls caused by Windows, so I wouldn't trust it. BTW these two programs don't seem to execute SMART self diagnostics right with drives bigger than 1TB or 1.5TB. |
#4
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UDMA CRC error count
larry moe 'n curly wrote:
If you're buying used drives locally, try to test them with MHDD (self boots from CD or USB stick) because when indicates what sectors are marginal and require multiple attempts to read them. Apparently some manufacturers considered it normal if a sector requires a dozen retries to read because each such brand new drive still passed its factory diagnostics. A full scan of a 1TB drive takes roughly 3 hours, much more if it's connected through USB 2.0. There's a Windows version of MHDD, called HDDscan, but it's a lot more likely to report slow sectors, probably because of stalls caused by Windows, so I wouldn't trust it. BTW these two programs don't seem to execute SMART self diagnostics right with drives bigger than 1TB or 1.5TB. Thanks LMC, I was looking for the name of that app just yesterday and couldn't find it in my records. I just built a system that's a little sluggish and I was looking to remap any bad sectors to see if that cleared it up. Jon |
#5
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UDMA CRC error count
Pimpom wrote:
I'm thinking of buying a used 1TB HDD as a backup for non-critical data. On request, the owner has provided a health report by HD Tune. It has one line highlighted in yellow. The line is "Ultra DMA CRC Error Count". The values are : Current - 200, Worst - 200, Threshold - 0, Data - 2, Status - warning I know what DMA and CRC mean separately, but could anyone please explain the significance of the report? I've heard that this error is caused by a faulty cable (I'm assuming that this includes poor contact at the connector). Is that all it is - that a CRC error occurred twice in the past (probably due to the cable) and normally does not indicate any problem with the drive itself? AFAICT, there doesn't seem to be any other abnormalities. No reallocated sector, no spin retry. Some other values - Start/Stop count - 206 Power on hours - 181 TIA for any helpful input. Thanks for the replies and sorry about the late one from my side. My internet connection has been acting up again. I decided to buy the drive and am expecting it today or tomorrow. With help from your inputs, I'm taking the chance that the CRC errors must have been due to external causes. |
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