Capacity (form atted) 10 Mbytes
Tracks per inch
345
Tracks per unit 612
Sectors per track 17
(1 as alternative sector)
Bytes per sector 512
M otor start time 15 sec
Head movement (track to track)
3msec
(average)
85msec
Date transfer time 5 Mbits/sec
Figure 2.20 Technical data
The technical details of the Western Digital disk controller are
shown in Figure 2.21.
Encoding method
MFM
Sectoring Soft
Host Interface 8-bit bi-directional bus
Data Transfer Rate 5.000 Mbits/sec.
Power Requirements
5V±5%, 3A max.
Figure 2.21 Controller technical data
The input and output signals for the drive are:
Write Gate
The active state of this signal, or logical one level, enables data
to be written on the disk. The inactive state of this signal, or
logical zero level, enables data to be transferred from the drive.
During power fail or power up, all data recorded on the drive
shall be retained reliably, regardless of the frequency of occur
rence of dc power transitions at the drive itself, and regardless
of the sequence and rate of dc voltage decay or rise; the user
must provide the WRITE GATE input with an open circuit
(inactive, high impedance driver) during these conditions.
Head Select 20 and 2l
These two lines provide for the selection of each individual
read/write head in a binary coded sequence. Head Select 20
is the least significant line. Heads are numbered 0 through 3.
When both Head Select lines are false, head 0 will be selected.
2-28
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