wd1600js slow on heads 0 and 3

[PAKcomputers]

I have a wd drive that will not read on the ddi. it will only read using pc3000.
it is a WD1600JS-75MHB0 Caviar SE - Marvell HAWK drive.

The lba's from 27,000,000 thru 88,000,000 on heads 0 and 3 are very slow

I have used DE to read heads 1 and 2 completely.
heads 0 and 3 read fine until 27,000,000 lba's, then got very slow
I then started reading from the end of the drive backwards. started getting timeouts at 88,000,000

although I read the first part of the drive without error for heads 0 and 3, it is now doing the same thing as the area from 27 - 88 million lba's

the drive will not boot on it's own, but i can successfully do a hot swap and read, but it is painfully slow and with lots of errors

I have swapped the heads and got the same results.
swapped the heads back to the donor and it reads fine.

Any thoughts ?

[Maxim_TS]

Hello,

There is could be a problem with the surface, since both sets of heads are reading so slow.
Also you can try to solve a Slow Responding problem, but most possibly the problem is in surfaces.

[cuumaytinh]

Head bad is slow too.
Change head is way to know,