Need to attach HDD to Windows 7 standalone

[apparatus]

You need to install Xen PV Storage driver either signed one from QWT, but notice about potential security issue with it:

QSB-091: Windows PV drivers potentially compromised

We have published Qubes Security Bulletin 091: Windows PV drivers potentially compromised. The text of this QSB and its accompanying cryptographic signatures are reproduced below. For an explanation of this announcement and instructions for authenticating this QSB, please see the end of this announcement. Qubes Security Bulletin 091 ---===[ Qubes Security Bulletin 091 ]===--- 2023-07-26 Windows PV drivers potentially compromised User …

Or unsigned driver from Xen:

Windows PV Drivers - Xen Project