7200.11 Heads swap problem

[ddd123]

Hello

We have problem with transplanting heads on 7200.11

we have donor
- same firmware
- same country
- same model

but the disk is not ok after swaping heads
a strange noises come from hdd

what's the problem?

Same problem we had with other ones

[harddrivespecialist]

What is wrong with original heads?
Where is terminal output?

[ddd123]

Preamplifier was bad.

Why doesnt work transplantating heads on 7200.11,
as i mentioned same donor.

[BlackST]

do heads back to donor work ?

[ddd123]

yes

heads back in Donor works

[DR-Kiev]

Probably it is not spinning enough fast.

What kind of noises? What says terminal?

[BlackST]

Ditto... Shift or not reaching target speed maybe !

[ddd123]

sound like trrrrrrrrrr

did you have success with changing heads on 7200.11
?

The original heads sounds, like repeated calibration, maybe one head is damaged\

but with new heads we get no sounds like before at all.