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Alastair Irvine
Asked: 2013-03-13 23:52:01 +0800 CST

Forcing a SCSI HDD to rewrite a damaged sector

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For a SATA/PATA HDD, this would be the normal procedure: http://www.sjvs.nl/?p=12

But a customer of mine has an old server with actual SCSI drives. I have tried re-writing the sector with dd to no avail; I keep getting the I/O error as per this quote from the above article: "I have a case were using dd to overwrite the sector produces an IO error and no reallocation. But using hpdparm works and forces the reallocation. Amazing."

How do I skip the kernel's block layer and force the drive to rewrite a specific sector? Lots of Googling hasn't found an answer.

PS -- SMART on SCSI HDDs works differently and doesn't show the reallocated sector count.

linux

1 Answers

  1. Best Answer

    You can try sg3_utils for linux. It can do many things with SCSI/SAS disks. For blocks reassign it have "sg_reassign" utility.

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