Key Features - Fujitsu M255XK Customer Engineering Manual

M2554K (Continued)
When set at 300 RPM the M2554K records 5,922 flux transistions per
inch (similar to a M2552K) and has a per disk unformatted storage
capacity of 1 Mbyte with MFM Encording or 500 Kbytes with FM
Encording.
When set at 360 RPM, the M2554K records 9646 flux transitions per
inch (similar to the M2553K). and has a per disk unformatted storage
capacity of 1.604 Mbytes with MFM Encording or 802 Kbytes with FM
Encoding.
With MFM recording methods, the data transfer rate is:
M2552K - 250 Kbi ts per second
M2553K - 500 Kbi ts per second
M2554K - 250 Kbits per second at 300 RPM
- 500 Kbits per second at 360 RPM
Spindle motor speed is:
M2552K 300 RPM
M2553K - 360 RPM
M2554K - Host system selected (via an interface signal line) for 300 or 360 RPM
On all Models, Track density is 96 TPI and there ere 80 cylinders/160 tracks per
disk. Track to track access time is 3 milliseconds, plus a 15 millisecond settling
time. Average access time, including settling time, is 94 milliseconds.
Except for the di fferences .listedabove, performance of the units is identical.
Refer to the M255XK Product Description Manual for an overview of the M2552K,
M2553K, and M2554K Mini Flexible Disk Drives.
1.3 KEY FEATURES
o Half-Height (1.625 inches)
o Industry standard flexible disk drive mounting
o Industry standard flexible disk drive interface
o Vertical clamping mechanism
o Up to 1.604 Mbytes of unformatted storage capacity
o The M2554K may be set by the host computer to function as a 1.6 Mbyte
or 1.0 Mbyte capacity disk drive (allowing a single source for two
products)
o High quality and reliability
o FUJITSU AMERICA support
1-2 TS-021-013087 ••• 01