replacing disk form other storage array

Hello everyoe,

As the title suggests, i want to replace a faulted SATA II disk from my cx4-120 with another SATA II disk from VNX series. So one of my colleague asked if this is even possible to replace a disk from other storage as there could be different firmware written on the disks.

This actually looks a dumb question. Is firmware pre loaded to disks or it is written at the time the disks is inserted, by the array itself.??