GS 640 Specifications

Media Capacities	128 MB	230 MB	540 MB	640 MB
Disk Format	90 mm MO disk ISO 10090	90 mm MO disk ISO 13963	90 mm MO disk ISO 15041
Storage Capacity
Unformatted	181 MB	325 MB	819 MB	818 MB
Formatted	128 MB	230 MB	538 MB	643 MB
Sectors/ track	25	25 (logical)	25 (logical)	17 (logical)
Sector Capacity (formatted)	512 Bytes	512 Bytes	512 Bytes	2,048 Bytes
Seek Time *1
Random seek *2	28 ms (typical)	28 ms (typical)	28 ms (typical)	28 ms (typical)
Full stroke	60 ms (typical)	60 ms (typical)	60 ms (typical)	60 ms (typical)
Average Latency Time	8.3 ms	8.3 ms	8.3 ms	8.3 ms
Rotational Speed	3600 rpm	3600 rpm	3600 rpm	3600 rpm
Data Transfer Rate
to/from media (max)	1.09 MB/s	1.3 to 2.1 MB/s	2.3 to 3.9 MB/s	2.3 to 3.9 MB/s
(continuous write)	0.256 MB/s	0.31 to 0.49 MB/s	0.51 to 0.86 MB/s	0.61 to 1.02 MB/s
(continuous overwrite)	--	0.46 to 0.73 MB/s	0.72 to 1.29 MB/s	0.92 to 1.53 MB/s
(continuous read)	0.76 MB/s	0.92 to 1.47 MB/s	1.54 to 2.58 MB/s	1.84 to 3.07 MB/s
to/from host	5 MB/s (async), 10 MB/s (sync)
Recording Code	2-7 RLLC	2-7 RLLC	1-7 RLLC	1-7 RLLC
Interface	SCSI –2 (Single-ended)
Head Positioning Method	Direct Track Count
Load Time	7 sec or less
Unload Time	5 sec or less
Data Buffer Size	2 MB
Power Consumption
Operating	5.3 W
Sleep Mode	1.5 W
Dimensions (H X W X D)	45 mm X 126 mm X 215 mm
Weight	900g or less
Ambient Temperature
Operating	5 to 35° C
Non-operating	0 to 50° C
Gradient	15° C/h (operating)
Relative Humidity
Operating	10 to 85%, no condensing
Non-operating	10 to 85%, no condensing
Vibration
Operating	0.4 G (5 to 500 Hz, sine sweep)
Non-operating	1.0 G (5 to 500 Hz, sine sweep)
Shock
Operating	2.0 G (10 ms, half sine pulse)
Non-operating	50 G (10 ms, half sine pulse)
Altitude
Operating	3,000 m
Non-operating	12,000 m
Reliability
MTBF *3	110,000 power on hours
MTTR *4	Less than 30 minutes
Component life	5 years
Recoverable errors	10 per 105 bits read
Unrecoverable errors	10 per 1013 bits read
Seek errors	10 per 107 seeks read

*1 Mathematical average of 1000 times of seek and does not include SCSI overhead nor track address recognition time. It depends on quality of the media, environment around the drive, etc. *2 Maximum value is 35 ms. *3 Mean Time Between Failure *4 Mean Time To Repair