Storage Capacity; Disk Mechanism - Fujitsu M255XK Customer Engineering Manual

2.2 STORAGE CAPACITY
Table 2-1 MFM Recording Storage Capacity*
300 RPM
360 RPM
MODEL NUMBER
M2552K
M2553K M2554K M2554K
UNFORMATTED:
Each Diskette 1.000MB 1.604MB
1.000MB 1.604MB
Each Track 6.25KB
1O.416KB 6.25KB 10.416KB
16-SECTOR FORMAT
Each Diskette 655.36KB
-
655.36KB
-
Each Track
4.096KB
-
4.096KB
-
Each Sector 256 Bytes
-
256· Bytes
-
FORMATTED 15-Sectors
Each Diskette
-
1.229MB
-
1.229MB
Each Track
-
7.680KB
-
7.680KB
Each Sector
-
512 Bytes
-
512 Bytes
BITS PER INCH
5922 9646
5922 9646
TRACKS PER INCH 96TPI 96TPI 96TPI
96TPI
I OF TRACKS
160 160 160 160
I OF CYLINDERS
80 80 80
80
TRANSFER RATE
250KBS 500KBS 250KBS 500KBS
*
=
One-half the given Storage Capacity values with FM Encoding.
2.3 DISK MECHANISM
Table 2-2 Disk Mechanism
300 RPM 360 RPM
MODEL NUMBER
M2552K M2553K M2554K M2554K
SPINDLE SPEED
300 RPM 360 RPM 300 RPM 360 RPM
AVERAGE LATENCY TIME
100 msec 83.3 msec 100 msec 83.3 msec
SPEED VARIATION
='1.5% Maximum Long Term
&
Instantaneous
ROTATIONAL CONTROL
AC Tachometer Controlled Frequency Servo
SPINDLE MOTOR TYPE
Direct Drive DC Brushless Motor
SPINDLE START TIME 400 milliseconds maximum
TS"()21-D1JOB7 ••• 01