Exabyte EXB-8505XLD 8mm SCSI 50PIN differential HVD Tape Drive This is a differential drive, HVD/High Voltage Differential, and is not compatible with a single-ended or LVD SCSI controller. Tested using Exabyte's Expert diagnostic software and it passed write/read test with very low error rates (see testing screen-shot). 30-day warranty. CEI: 872113-025 - This drive was initially in a library carrier but was removed and a bezel added for stand-alone use.