Mass storage The hard disk drive can be removed by the user for easy upgrades. The hard drive is located on the bottom case and with the removal of one screw the hard drive can be replaced. Hard drive manufacturer: IBM and Toshiba (subject to change without notice). 16 2.5" Hard Drive 540MB 810 MB 810 MB 1,215MB AT Interface RLL ATA2 Interface ATA2 Interface ATA2 Interface HDD (Toshiba) Note: VL models shipping 11/95 will have the 540MB option HDD (Toshiba) HDD (IBM) Note: Current plan is to dual source the 810MB hard drive, currently the Toshiba 810 is the major supplier HDD (IBM) Note: Currently the 1.2GB drive is sole sourced from IBM.
Average seek (read) 12 ms 12 ms 12 ms 12 ms Track to track seek 3 ms 3 ms 4 ms 4 ms Full Track NA 25 ms 23 ms 23 ms Average latency 7.5 ms 7.1 ms 6.1 ms 6.1 ms Rotational speed 4000 rev/m 4200 rev/m 4900 rev/m 4900 rev/m Data transfer rate: Media Transfer rate 18.9-31.6 Mbits/sec 43.75 Mbits/sec (max.) 36.3 (inner), 57.0 (Outer) Mbits/sec 36.3 (inner), 57.0 (Outer) Mbits/sec Buffer to host 6 Mbytes/sec 11.1Mbytes/sec 11.1Mbytes/sec 11.1Mbytes/sec Buffer size 128 Kbytes static RAM 128Kbytes static RAM 64KB (read and write segmented buffer) 64KB (read and write segmented buffer) Spindle start time 5 sec (typical) 5 sec (typical) NA NA Reliability: MTBF:
Power-on Hours 300,000 hours 300,000 hours 300,000 hours 300,000 hours Unrecoverable errors 1 in 1013 (bits) 1 in 1013 (bits) 1/1.0E 13 bits transfer 1/1.0E 13 bits transfer Configuration: 2.5" Hard Drive 540MB 810 MB 810 MB 1,215MB