before proceed with the steps to solve your problems make sure you check the ID, the ID for dv7 i have is ACPI/HPQ0004 so it is the:
ProtectSmart Hard Drive Protection
Download
this will solve 3 unknown device and the other one left is:
HDD protection feature:
Download
ProtectSmart Hard Drive Protection
Download
this will solve 3 unknown device and the other one left is:
HDD protection feature:
Download