my notebook HDD has reallocated sectors count is it possible to recover this HDD to use for many years?
100 million sectors would amount to 50GB. I can't see how that would be possible.At work, I found a machine which was running very slowly - in use since about 2012, its old HDD had several hundred MILLION reallocated sectors.
Well, on a 250 GB disk with an OS partition and lightly used storage partition, not unrealistic ;-) CDM diligently reported the sectors, I was inclined to believe it... The disk ran like an LTO3, it was so slow100 million sectors would amount to 50GB. I can't see how that would be possible.
I suspect that the raw value would look a lot less frightening if it were expressed in hexadecimal. For example, some Toshiba models had reallocated sector counts which actually consisted of 3 hexadecimal numbers.
Hitachi was the other example I was thinking of. When you convert the reallocated sector count to hexadecimal, you get a number which actually consists of two 16-bit numbers:Well, on a 250 GB disk with an OS partition and lightly used storage partition, not unrealistic ;-) CDM diligently reported the sectors, I was inclined to believe it... The disk ran like an LTO3, it was so slow
Ah so it was hex representation. Honestly given the performance I assumed the parity in the raid it was a member of was handling the problem - just about - and didn’t bother to do those conversions to see There was evidently more than one issue with that drive.Hitachi was the other example I was thinking of. When you convert the reallocated sector count to hexadecimal, you get a number which actually consists of two 16-bit numbers:
107873993 = 0x66E06C9 -> 0x066E / 0x06C9
The actual number of reallocated sectors is either 0x06C9 (= 1737) or 0x066E (= 1646).
No drive has 50GB allotted for spare sectors. The grown defect list (G-list) is a firmware module which is stored in a hidden, reserved System Area (SA) on the platters. This module is very small. It probably only handles a few thousand sectors. (I can find out the exact amount if you are interested.)
Very interesting, thanks for the follow-up with more info about the specifics of that model drive. HDDGuru is a site I am preparing to spend unhealthy amounts of time reading.Your model is HDS721025CLA382 (HGST Deskstar 7K1000.C).
This is the product manual:
Hard Disk Drive Specification for HGST Deskstar 7K1000.C, HGST Ultrastar A7K2000, HGST CinemaStar 7K1000.C:
Here are two firmware resource dumps for the 500GB version:
http://files.hddguru.com/download/PC-3000-UDMA Support/Hitachi-IBM/Hitachi HDS721050CLA662-JP2OA41A-JP1572JE2P59GK.rar
http://files.hddguru.com/download/PC-3000-UDMA Support/Hitachi-IBM/Hitachi HDS721050CLA662-JP2OA41A-JP1572FN204YTK.rar
The RDMT.rpm module is the grown defect list. Its size is 32KB. Unfortunately it's empty in both cases, so I can't work out its structure. However, if we assume that each defect would be described with 8 bytes, then that corresponds to a maximum of 4096 reallocations. I guess it is possible for an entry in the list to correspond to an entire track, so that might allow for more sectors.
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