Overview: The 20/40 GB DAT tape drive is available in internal external hot-plug and rackmount configurations. As the tape drive for entry-level and workgroup servers this device offers 20 GB native capacity on a HP DDS-4 cassette with a transfer rate of 2.3 MB/sec. ??Advancements in tape technology have produced a tape drive that requires less cleaning and provides improved backup/restore operation. Some of these new advancements include an automatic rotating head-cleaning sweeper that is used during the write or read recovery procedure to dislodge debris in the recording heads and drum. This DDS-4 drive has a MTBF rating of 250 000 hours at a 30% duty cycle.