 Lt. Kernal uses a 5¼" Hard disk drive with a capacity of 10 MB and later up to 330 MB.The hard drive uses MFM modulation to encode data and a ST-506 interface to the OMTI 5300 intelligent SASI controller.This controller board presents a SASI interface (SCSI) externally that is connected via a cable with DB-25 connectors in both ends.