10
HP DDS DRIVES USER GUIDE
Specification of HP DDS tape drives
Performance specifications apply when using data compression.
Power specifications are measured at the tape drive power
connector and are nominal values.
The compression ratio and transfer rate achievable in any
particular case depend on the characteristics of the data being
compressed.
Nominal capacities
60-metre cassette
1.3 Gbyte (1:1 base)
(DDS)
2.6 Gbyte (2:1 typical)
5.2 Gbyte (4:1 max
1
)
90-metre cassette
2.0 Gbyte (1:1 base)
(DDS)
4.0 Gbyte (2:1 typical)
8.0 Gbyte (4:1 max
1
)
120-metre cassette
4.0 Gbyte (1:1 base)
(DDS-2)
8.0 Gbyte (2:1 typical)
16.0 Gbyte (4:1 max
1
)
125-metre cassette
12.0 Gbyte (1:1 base)
(DDS-3)
24.0 Gbyte (2:1 typical)
Transfer rates
DDS
366 Kbyte/s (1:1 base)
732 Kbyte/s (2:1 typical)
1464 Kbyte/s (4:1 max
1
)
DDS-2
400 Kbyte/s (1:1 base)
800 Kbyte/s (2:1 typical)
1608 Kbyte/s (4:1 max
1
)
DDS-3
1000 Kbyte/s (1:1 base)
2000 Kbyte/s (2:1 typical)
1
Nominal maximum only; can be exceeded for highly-compressible data.
Note DDS-3 standard is only on the DDS-3 drive.
Unrecoverable errors
Less than 1 in 10
15
data bits
Recording format
ANSI/ECMA (DDS-DC, DDS-2/3)
Power specification
Voltage
+12 Vdc ± 10%
+5 Vdc ± 5%
Ripple
+12 V: <=150 mVp-p
+5 V: <= 150 mVp-p
Current (operational)
0.4 A @ +12 Vdc, 0.8 A @ +5 Vdc
Current (peak)
0.9 A @ +12 Vdc, 1 A @ +5 Vdc
