Seagate 240 DDS-4 manual Summary of drive specifications

A-54Scorpion 240 Autoloader Installation Manual

Summary of drive specifications

Category	Specification (six-cassette magazine)
Performance specifications
Tape length/type	(based on 2:1 data compression)
90 m MP	24.0 Gbyte (4.0 Gbytes / cassette)
120 m MP+	48.0 Gbyte (8.0 Gbytes / cassette)
125 m MP++	144.0 Gbyte (24.0 Gbytes / cassette)
150 m MP+++	240.0 Gbyte (40.0 Gbytes / cassette)
Recording density (DDS-4)	122,000 bpi
Track density (DDS-4)	147.34 tracks/mm
Error recovery	Read-after-write, Reed Solomon ECC,
	(C3 - 3 levels)
Unrecoverable recording errors	< 1 in 1015 data bits
Head configuration	2 read heads, 2 write heads
Recording format	DDS-1, DDS-2, DDS-3, DDS-4
Cartridge dimensions	2.9 in. x 2.1 in. x 0.4 in.
Transfer rate (sustained)	2.75 Mbyte/sec uncompressed
	5.5 Mbyte/sec compressed
Synchronous transfer rate (burst)	80 Mbyte/sec max (LVD)
	40 Mbyte/sec max (single-ended)
Search speed	400 X normal speed
Average access time	(single cassette)
90 m tape	<30 sec
120 m tape	<40 sec
125 m tape	<40 sec
150 m tape	<40 sec
Load Time	≤ 15 sec
Cassette swap time	≤ 8.5 sec
Drum rotation speed	10,000 RPM