Dell OptiPlex GX1p - Manual (Page 98)

Hard-Disk Drive Options: Dell™ OptiPlex™ GX1p
The hard-disk drive assembly (consisting of the hard-disk drive and the hard-disk drive bracket) is located next to the externally accessible drive bays at the front of
the computer. The hard-disk drive assembly can contain one of the following:
l 1 or (2) 1-inch-high EIDE hard-disk drives
l (1) 1-inch-high EIDE and (1) 1.6 inch-high EIDE hard-disk drive
l (1) 1-inch-high SCSI hard-disk drive
l (1) 1.6-inch-high SCSI hard-disk drive
NOTE: Dell does not support using 2 SCSI hard-disk drives in the system because of thermal issues. You can use an IDE hard-disk drive and a SCSI
hard-disk drive in the same system, but Dell does not offer this configuration as a factory build option.