User`s guide

2
The Bering Box
4.5 GB Fixed
Disk
The Option 04 fixed disk in this model is the Seagate Medalist Pro 4520 SCSI, model
ST34520N. This drive is a 3.5 inch form factor drive. Depending on the model of the
Bering Box you have, the drive may be paired with another 4.5 GB fixed disk, a DDS-
2 tape drive, or a DDS-3 tape drive. The operating instructions and specifications for
the tape drives will be in a separate booklet included with your Bering
●
Box.
Operation
Refer to your computer system’s operation manual for specific instructions on using
this drive with your system. This document provides only specifications for the drive.
Refer to the Bering
●
Box 800 User’s Manual for physical hookup instructions.
Specifications
PERFORMANCE
Formatted capacity 4.55 GB formatted
Interface 50-pin Ultra SCSI (SCSI-2)
Number of discs (physical) 2
Number of heads (physical) 4
Total cylinders 9,006
Total tracks 36,024
Avg. sustained transfer rate 12.4 MBytes/sec
Max external transfer rate 20 MB/sec
Avg. seek time, read 9.5 msec
Avg. seek time, write 10.5 msec
Track-to-track seek, read 2.5 msec
Track-to-track seek, write 3.5 msec
Full disk seek, read 21 msec
Full disk seek, write 23.5 msec
Avg. latency 4.17 msec
Default buffer (cache) size 512 Kbytes
Spindle speed 7,200 RPM
Power-on to ready time 20 sec
MTBF 800,000 POH, 12% duty
ENVIRONMENTAL
(operational)
Temperature 0 to 55° C
32 to 131° F
Temperature gradient 20 °C/hour
Relative humidity 10 - 90%
Vibration 0.5G
Altitude 0 ~ 3,048Meters
0 ~ 10,000 Feet
ENVIRONMENTAL
(non-operational)
Temperature -40 to 70 °C
-40 to 158 °F
Relative Humidity 5 - 95%
Vibration 2 G
Shock 200G peak, 2msec
Altitude 0 ~ 12,210 Meters
0 ~ 40,000 Feet