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 Post subject: ST31000520as Buffer size: ZERO
PostPosted: January 17th, 2012, 13:07 
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Joined: September 19th, 2011, 14:14
Posts: 16
Location: ROMANIA
Hi Guru's!
I heave this 1 tb hard drve. In midsummer I put win on it, works fine 'till late december when encounteret some bsod's then pulled out for autopsy.
buffer size is ZERO, reoprted by HDtune, hitachi feature tool...it is there a solution to make the buffer just be there and hope to make the drive work better...I don't know, I just kan't figure out how...


thank you.


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 Post subject: Re: ST31000520as Buffer size: ZERO
PostPosted: January 17th, 2012, 15:35 
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Joined: September 19th, 2011, 14:14
Posts: 16
Location: ROMANIA
why the buffer goes to zero?
it is possible a Diy?
a firmware update change something?
someone encountered this before?
sorry for doublepost


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 Post subject: Re: ST31000520as Buffer size: ZERO
PostPosted: January 17th, 2012, 17:06 
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Joined: September 8th, 2009, 18:21
Posts: 16955
Location: Australia
A drive reports its cache size via the ATA Identify Device command. The drive returns 512 bytes of information, including its model number, serial number, capacity, etc. The cache size was formerly reported in word 21. However, this word was long ago "retired" from the standard. Despite this, the HDD manufacturers have continued to use it, until recently.

The following article explains in detail why no drive can report a cache capacity in excess of (32MB - 512 bytes). In short, it is because this size equates to a maximum value of 0xFFFF for word 21 in the ATA Identify Device data block.

http://seagate.custkb.com/seagate/crm/s ... cId=203631

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 Post subject: Re: ST31000520as Buffer size: ZERO
PostPosted: January 17th, 2012, 19:05 
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Joined: September 19th, 2011, 14:14
Posts: 16
Location: ROMANIA
thank you
this drive beacome busy beacouse of a bad sector at a moment
this busy state(I heave to do a power on/off to ghet it back) can be repaired to not appear again, with a diy operation or no....


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 Post subject: Re: ST31000520as Buffer size: ZERO
PostPosted: January 17th, 2012, 22:13 
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Joined: August 18th, 2010, 17:35
Posts: 3669
Location: Massachusetts, USA
Can't repair that. If the drive is in that bad shape, I think it is best to try to RMA it.
The more you use it, the worse is going to get.

Also, are the bad sectors concentrated in one area or spread out throughout the drive? You can use MHDD to get a sense of this.

If you will need data of that drive as in data recovery, then do not force the drive by scanning too much. I would stop right now depending on how important that data is.

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Hard Disk Drive (HDD), Solid State Drive (SSD, SATA, NVMe, etc), USB Flash Drive and RAID Data Recovery Specialist in Massachusetts


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 Post subject: Re: ST31000520as Buffer size: ZERO
PostPosted: January 18th, 2012, 13:44 
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Joined: September 19th, 2011, 14:14
Posts: 16
Location: ROMANIA
thank you
the hard drive was sold as a system part,seagate sez...so no rma. till now ,never tried a rma, maybe the price of shipping equals half the price of a new one,I wonder about...
bads...grouped and spread all togheder, a big mess,its a wrek
after somone see the smart attributes can tell something about its future and tring something, I see nothing left to do.
I do not want data recovery, just want a drive.


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 Post subject: Re: ST31000520as Buffer size: ZERO
PostPosted: January 18th, 2012, 14:23 
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Joined: May 6th, 2008, 22:53
Posts: 2138
Location: England
BOGDANB1 wrote:
just want a drive.

Forget it - the drive has an internal problem, so IMHO you are wasting your time, if you think you can make this drive reliable yourself.

As a minimum, erase the whole disk by wiping (not just deleting files) if you are considering giving / selling the drive to anyone else for spare parts - but a DR company or skilled amateur could read any personal data from the 4015 reallocated sectors, even if you wipe the user-accessible LBAs. If confidential data was ever stored on the disk, you may want to consider destroying/deforming the platters.


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 Post subject: Re: ST31000520as Buffer size: ZERO
PostPosted: January 18th, 2012, 14:31 
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Joined: September 8th, 2009, 18:21
Posts: 16955
Location: Australia
Vulcan wrote:
... but a DR company or skilled amateur could read any personal data from the 4015 reallocated sectors, even if you wipe the user-accessible LBAs.

AIUI, an Enhanced Secure Erase will erase the reallocated sectors, assuming the drive supports this ATA command.

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 Post subject: Re: ST31000520as Buffer size: ZERO
PostPosted: January 18th, 2012, 14:43 
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Joined: May 6th, 2008, 22:53
Posts: 2138
Location: England
Not in all cases - I have seen f/w bugs which caused the reallocated sectors not to be erased (i.e. no difference to a normal Secure Erase).

As you say, the OP could choose to rely on that functionality, if they want to do that and if it is (reportedly) supported on that drive. :) Having seen this "enhanced" functionality fail, I keep forgetting to mention it to others (with appropriate warnings), as I don't rely on it myself.

P.S. This is different from the HDDErase bug which claimed to issue an Enhanced Secure Erase command, but didn't until v3.3:

http://cmrr.ucsd.edu/people/Hughes/HDDEraseReadMe.txt


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