I have a MHV2080BH, P/N CA06672-B273000T, PCB: VD6X06 404DC. I know for desktop, compatibility is first char of xx-xxxx. However I don't see anything in this format on laptop. Any suggestions on guaranteeing compatibility (pcb and head stack)? Thanks.

there is a firmware revision on the label.

Usually ending in "xxx-00000000A0" or something similar, match this.

I have a number diectly under the REV. NO. A 0 1 2 ...and directly above the drive size...

that says "0BDD7B-0000002A" Sound right?

You can usually go by model and firmware revision. If you are looking at PCB compatibility then you definitely need to match the firmware revision, especially the last 7 characters. These last 7 are typically underneath the "revision" line and will be something like: 3CE-022C. You can get a close match of this when it comes to dealing with parts compatibility, such as 3BE-022C would be compatibile with the above example for heads.

yep, the 00000002A is the F/W version.

3CE-022C sounds more like F/ version from desktop drives (e.g. MPG etc) to me, but could be wrong