IBM PN55F9818 TYPE 0663 HARD DRIVE 1GB 50 PIN SCSI 55F5975 ae1z4
IBM 55F5975 1GB 50 PIN SCSI. As their type 0663 part number 55F9818 and FRU 55F5975, this is a 3.5 form factor (half height) standard old technology 50 pin SCSI hard disc drive, 1Gb capacity. Supplied in the mounting frame as pictured.