wd10jmvw weird pattern

[Alandata Recovery]

This drive has read errors in a regular pattern

this pattern is too regular for it to be real errors.
they are grouped

This is only on heads 2 and 3

and none after 24M

Seems like a problem with the zone translator?

Assuming these are 4K-sector LBAs (4096 bytes per sector):

Start LBA End LBA Length (Sectors) Size (Bytes) Size (MiB)
1114481 1119409 4,928 20,185,088 19.25 MiB
1716754 1727700 10,946 44,834,816 42.76 MiB
2195563 2211087 15,524 63,586,304 60.64 MiB
5732044 5745084 13,040 53,411,840 50.94 MiB
7169829 7185621 15,792 64,684,032 61.69 MiB
8146691 8168469 21,778 89,202,688 85.07 MiB

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[Philip Shaw]

Wayne, what am I missing? This looks like a classic scratch pattern.

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[RecuperoDati299]

I agree 

seen many times

that happens

have you swapped the heads?

disappears after how many sectors?

do you mean 24MB or GB?

because the first 24MB are relative to just and only head 0 in such family 

Please give some more details on the numbers (from sector to sector, how many)

but again, from the map, looks a common lil' scratch pattern 

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[Alandata Recovery]

It's just so perfectly regular. 

Then after 24m sectors it disappears.

And it's always 1-2 sector

Just weird

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[Alandata Recovery]

Yes swapped heads

Disappears after 24 million lba 4k

Only on heads 2, 3

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[RecuperoDati299]

Did you swapped the heads originally because they were bad or because of this pattern?

Because if for the pattern, you have the confirmation that the issue is a little scratch

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[Alandata Recovery]

no head swap

drive was having trouble in startup

converted to sata board

and imaged

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[RecuperoDati299]

12GB (24M sectors) is nothing if you think about sectors distribution in relation to the radius/circumference 

when heads are weak you have unstable reading up to 1/3 - 1/2 of the capacity

so you are definitely in the circumference of a micro damage at the very-very begin of those surfaces and I mean something sitting in the first 0.3 0.5 mm from the very outside border of those surfaces

though you can clone all that is possible (usually just the used sectors from bitmap map in this case of partially missing MFT)

then scan MFT+INDEX on copy only.

That would give the maximum under file-tree

then map those files and cut the used map from bitmap to run a RAW scan on the not indexed part.

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