Hitachi drives PCB swap

[BGman]

I have found out that swapping PCB of drives with identical part number, MLC and firmware doesn't result in good working drives. My question is:
Is there any adaptive data stored in the NVRAM of these drives?

[CK]

It depends on which model hitachi drive it is.

For example, the ATMR series needs to have the NVRAM moved to the new PCB as it stores adaptives.

[rameez]

In most of the hitachi/IBM drives there is a nvram which u have to swap while changing pcb to make it work .

[BGman]

In most of the hitachi/IBM drives there is a nvram which u have to swap while changing pcb to make it work .

It's not true for the old IBM drives from DTLA, AVER and AVVA families if the Partnumber and MLC of both drives are identical.

I'm interested about the newer families - PLAT, VLAT, DLAT, etc.

[rameez]

For IBM i swap nvram to make pcb work never paid any attention to Partnumber and MLC code for pcb swap . PLAT has nvram to store adaptives so u have to change it to make pcb work .