Compatibility of Z1 models (old & new)

[rh3311]

You are very kind to make this so clear to me. Thank you very much.  My 2 old drives only store data, so I don't expect any problems now to swap them over. Thanks again for your help with this.

[DGroves]

 i stand corrected,.....the G9 quickspecs i linked to and the HP partsurfer both only show 2.5in devices for the g9 although your pictures clearly show it saying 3.5

i've come across a few HP models where the drive bay looks like it's for a 3.5in device but in reality it only takes a system specific 2.5in bracket that is almost the size of a 3.5in drive