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Read/Write Head And Track Specifications; Power Requirements - Fujitsu M255XK Customer Engineering Manual

5 1/4" mini-flexible disk drive
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2.6 READ/WRITE .-EAD AND TRACK SPECIFICA nONS
Table 2-5 Read/Write
Head
and Track Specifications
TYPE OF R/W HEAD
Gimbal supported with Tunnel Erase
NUv1BER OF R/W HEADS
Two (one on each side of the Diskette)
R/W HEAD TRACK WIDTH
0.165mm standard
0.155 !: 0.0l5mm after Tunnel Erase:
ERASE HEAD WIDTH
0.095mm standard
WRITE/READ - ERASE GAP
0.85 !: 0.05mm - M2552K
0.58 !: 0.05mm - M2553K and M2554K
WRITE/READ GAP AZIMUTH
O!: 26' - M2552K
Standard Test Diskette
o
!: 18' - M2553K and M2554K
TRACK RADIUS (Maximum)
Track 00 (External Lap):
57.150mm Side 0
55.033mm Side 1
Track 79 (Internal Lap):
36.248mm Side 0
34.131mm Side 1
2.7
POWER REQUIREMENTS
Table 2-6 Power Supply Requirements
+12 VOLTS DC
!:5% allowable variance during read/write operations and !:10%
at other times
200 millivolt maximum peak-to-peak ripple voltage
(including noise spikes)
0.22 Amperes average current draw
0.60 Amperes maximum average current draw
0.90 Amperes peak current draw (Spindle Motor start-up)
0.07 Amperes maximum current draw (Spindle Motor idle)
+5 VOLTS DC
!:5% allowable variance
.
100 millivolt maximum peak-to-peak ripple voltage.
(including noise spikes)
-
0.29 Amperes average current draw
0.33 Amperes maximum current draw (Spindle Motor idle)
0.50 Amperes maximum average current draw (standby mode)
0.60 Amperes maximum average current draw (operating)
2-4
TS-021-013087 ••• 01

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