Equipment Specifications - Silicon Graphics DSS-1 Hardware Description

Product Overview DSS-1 and DSS-2 Hardware Description
Equipment Specifications
14
Table I contains a list of physical, functional, and performance specifications
for the disk subsystem and for each drive in the subsystem.
Table 1. DSS-1IDSS-2 Equipment Specifications
Parameter Value
DSS-1/DSS-2 specifications (installed in a PC-l0 cabinet):
Height 7.0 in. (19.1 cm) (4 SU)
Width
22.25 in. (56.5 cm)
Depth 23.0 in. (58.4 cm)
Weight 90 Ib (40.9 kg) maximum
Power required 115 Vac, 4.0 Amp
230 Vac, 2.0 Amp
47-63Hz
Cooling required
1.1 kBtuihr maximum
Drive specifications (installed in a DSS-l/DSS-2 enclosure):
DD-318 Disk Drive
DD-314 Disk Drive RD-318 Disk Drive
Capacity (formatted in 4509 Mbytes 9439 Mbytes
4096-byte sections)
Logical block size 4096 bytes 4096 bytes
(sector size)
Logical blocks 1,048,000 1,048,000
Read/write heads 20 20
Data cylinders
3711 5273
Tracks/surface 3711 5273
Bytes/surface 215 Mbytes 470 Mbytes
Sectors/track 12 - 18 16 - 27
Bytes/track 49,350 (minimum) 78,540 (minimum)
74,900 (maximum)
122,173 (maximum)
29 zones 7 zones
Rotational speed 7200 rpm 7200 rpm
Rotational latency 4.17 ms (average)
4.17 ms (average)
Seek time (average) 8 ms (read) 8.2 ms (read)
9 ms (write) 9.7 ms (write)
Track-to-track seek time 1.6 ms (read) 0.8 ms (read)
1.9 ms (write) 1.2 ms (write)
FUll-stroke seek time 20.0 ms 20.2 ms
Sustained transfer rate 4.8 - 7.4 MBytes/s
8 - 12 MBytes/s
Data buffer (cas he-usable) 954 Kbytes 1948 Kbytes
Sil icon Graph ics Proprietary HMM-199-A