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Storage Capacity; Disk Mechanism - Fujitsu M255XK Customer Engineering Manual

5 1/4" mini-flexible disk drive
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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

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