| Seagate DAT 20/40 GB DDS-4 Tape Drive Specifications |
Capacity |
90 m MP: 4.0 GB
120 m MP+: 8.0 GB
125 m MP++: 24.0 GB
150 m MP+++: 40.0 GB |
| Flux Density (DDS-4) |
6,004 flux transitions per mm |
| Track Density (DDS-4) |
147.34 tracks per mm |
| Error Recovery |
Read-after-write
Reed Solomon ECC (C3 - 3 levels) |
| Recording Unrecoverable Errors |
<1 in 1015 data bits |
| Tape Drive Type |
Computer grade 4DD mechanism |
| Head Configuration |
2 read heads, 2 write heads |
| Recording Format |
DDS-4 |
| Recording Method |
Helical scan (R-DAT) |
| Cartridge |
2.9 in. × 2.1 in. × 0.4 in. |
| Transfer Rate (Sustained) |
5.500 KB per sec (DC ON) |
| Synchronous Transfer Rate (Burst) |
80 MB per sec (max) |
| Asynchronous Transfer Rate (Burst) |
10 MB per sec (max) |
| Search Speed (max) |
400x normal (3260 mm per sec) |
| Average Access Time |
90 m cartridge: <30 sec
120 m cartridge: <40 sec
125 m cartridge: <40 sec |
| Drum Rotation Speed |
10,000 RPM (all DDS modes) |
| Tape speed |
20.375 mm per sec. |
| Head-to-tape speed |
20.4 mm per sec. |
| Voltage Tolerance |
+12 VDC supply: ±10%
+5 VDC supply: ±7% |
| Operational Current |
+12 VDC supply: 250 milliamps (max)
+5 VDC supply: 1.35 Amps (max) |
| Standby Current |
+12 VDC supply: 15 milliamps (max)
+5 VDC supply: 1.2 Amps (max) |
| Surge (Peak) |
+12 VDC supply: 600 milliamps (max)
+5 VDC supply: 1.5 Amps (max) |
| Ripple (Peak-to-Peak) |
+12 VDC supply: <= 100 mV
+5 VDC supply: <= 100 mV |
| Temperature |
Operating: +41° to +113°F (+5° to + 45°C)
Non-operating: –40° to +149°F (–40° to + 65°C) |
| Thermal Gradient |
Operating: 2°C per minute
(no condensation)
Non-operating: Below condensation |
| Relative Humidity |
Operating: 20% to 80%
non-condensing
Non-operating: 0% to 90%
non-condensing |
| Maximum Wet Bulb Temperature |
Operating: 82.4°F (28°C)
Non-operating: No condensation |
| Altitude |
Operating: –100 to +4,575 meters
Non-operating: –300 to +15,200 meters (power off) |
| Nonrecoverable Error Rate |
<1 in 1015 bits |
| Error Recovery and Control |
Error-correction code techniques (C1, C2, & C3 ECC)
Read-after-write (RAW)
N-Group writing (DDS-1 and DDS-2 modes only)
Error monitoring and reporting (error log)
Retry on read
Data randomizer
Track checksum |
Mean Time Between Failures
(MTBF) |
412,000 hr at 20% duty cycle |
Mean Time to Repair
(MTTR) |
Less than 0.5 hours |
| Dimensions (H × W × L) |
1.6 × 5.74 × 6.9 inches (41.2 × 146.0 × 175.0 mm) |
| Weight |
1.8 lb (0.87 kg) |
United States
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