1-8 110 Series
1.3 3.5-Inch Floppy Disk Drive
The 3.5-inch Floppy Disk Drive (FDD) is a thin, high-performance reliable drive that sup-
ports 720-KB (formatted) 2DD and 1.44-MB (formatted) 2HD 3.5-inch floppy disks.
The FDD is shown in Figure 1-4.
Figure 1-4 3.5-inch FDD
Table 1-1 lists the FDD specifications.
Table 1-1 3.5-inch FDD specifications
Item 2-MB mode 1-MB mode
Storage capacity (KB)
Unformatted 2,000 *1 1,000 *2
Formatted 1,440 720
Number of heads 2 2
Number of cylinders 80 80
Access time (ms)
Track to track 3 3
Average 181 181
Head settling time 15 15
Recording track density (tpi) 135 135
Data transfer rate (Kbps) 500 250
Rotation speed (rpm) 300 300
Recording method Modified Frequency Modulation (MFM)
*1: 18 sectors/track (512 bytes/sector)
*2: 9 sectors/track (512 bytes/sector)
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