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1.3
3.5-inch Floppy Disk Drive
The 3.5-inch FDD is a thin, high-performance reliable drive that supports 720-KB (formatted)
2DD and 1.44-MB (formatted) 2HD 3.5-inch floppy disks.
The FDD is shown in figure 1-4.
The specifications for the FDD are listed in table 1-1.
Storage capacity (KB)
Unformatted
Formatted
Number of heads
Number of cylinders
Access time (ms)
Track to track
Average
Head settling time
Recording track density (tpi)
Data transfer rate (Kbps)
Rotation speed (rpm)
Recording method
*1:32 sector/track (256bytes per sector)
*2:16 sector/track (256bytes per sector)
1-8
Figure 1-4 3.5-inch FDD
Table 1-1 3.5-inch FDD specifications
Item
2-MB mode
1-MB mode
2,000 *1
1,000 *2
1,311
2
80
3
181
15
135
500
300
Modified Frequency Modulation (MFM)
655
2
80
3
181
15
135
250
300
100CS
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