HP 40 SCSI manual Reliability, Uncorrected Error Rate, Recommended media, Backward read-write

QuickSpecs

HP StorageWorks DAT Drives

Technical Specifications

Rewind Tape Speed	1.41 m/s	1.41 m/s	1.41 m/s
(USB)
Reliability	DAT 24	DAT 40	DAT 72
MTBF (SCSI)	300,000 hours	125,000 hours	125,000 hours at 100%
	at 12% duty cycle	at 100% duty cycle	duty cycle
Uncorrected Error Rate	1x1015 bits read	1x10-17bits read	1x10-17bits read
(SCSI)
MTBF (USB)	125,000 hours	125,000 hours	125,000 hours at 100%
	at 100% duty cycle	at 100% duty cycle	duty cycle
Uncorrected Error Rate	1x10-17bits read	1x10-17bits read	1x10-17 bits read
(USB)
Media	DAT 24	DAT 40	DAT 72
Recommended media	DDS-3 (125m)	DDS-4 (155m)	DAT 72 (170m)
Backward read-write	DDS-2 (120m)	DDS-3 (125m)	DDS-4 (155m)
compatibility (SCSI)	DDS (60 and 90m)	DDS-2 (120m)	DDS-3 (125m)
Backward read-write	DDS-2 (120m)	DDS-3 (125m)	DDS-4 (155m)
compatibility (USB)		DDS-2 (120m)	DDS-3 (125m)
Tape Format	DAT 24	DAT 40	DAT 72
Recording Method	4 mm helical scan	4 mm helical scan	4 mm helical scan
Recording Format	DDS-3, DDS-2, and DDS DDS-4, DDS-3, and		DAT 72, DDS-4, DDS-3
(SCSI)	(ANSI/ISO/ECMA)	DDS-2	(ANSI/ISO/ECMA)
		(ANSI/ISO/ECMA)
Recording Format (USB)	DDS-3 and DDS-2 DDS	DDS-4, DDS-3, and	DAT 72, DDS-4, DDS-3
	(ANSI/ISO/ECMA)	DDS-2	(ANSI/ISO/ECMA)
		(ANSI/ISO/ECMA)
Data Compression	Lempel-Ziv (DCLZ)	Lempel-Ziv (DCLZ)	Lempel-Ziv (DCLZ)
Error	Reed-Solomon	Reed-Solomon	Reed-Solomon
Detection/Correction
Data Encoding Method	Partial Response	Partial Response	Partial Response
	Maximum Likelihood	Maximum Likelihood	Maximum Likelihood
	(PRML)	(PRML)	(PRML)

DA - 11883 Worldwide — Version 15 — March 20, 2006 Page 26