Mitsubishi Electric Apricot LS Pro, Hardware Technical Reference

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Chapter 4
Chapter 6
Chapter 4
Peripheral items
Appendix A
Appendix C
Pr
eface
Chapter 4
LS PRO HARDWARE TECHNICAL REFERENCE 4/11
Maxtor 7213A
The 213 Mbyte hard disk drive that may be fitted in the LS Pro range is a Maxtor 7213A.
It has a nominal access time of 15mS and can transfer data at up to 8.0 Mbytes per
second.
The drive circuit board contains the drive control electronics and a hard disk
controller. A read preamplifier and the write drive circuitry are located underneath
the drive cover.
The drive features an on-board media defect and error recovery scheme which is fully
user transparent.
Jumpers Nine jumpers on the drive circuit are used to configure the drive. These are shown,
properly configured, in the following illustration.
The jumpers are labelled J16 to J20 and J22 to J25. In the LS Pro application only J20
should be fitted. If J20 is not fitted or if any of the other jumpers are fitted the drive
is unlikely to operate correctly.
Drive format The drive has two disks and four data surfaces, and features a Universal Translate Mode
which allows it to be configured with any combination of cylinders, heads and sectors
within the drive’s formatted capacity.
Formatting
These drives are low level formatted during manufacture. This format has been
optimized to allow the drive to provide maximum performance. Standard low level
formatting programs can only reduce the performance of the drive.
Warning
Do not attempt to perform a low level format, this can only adversely affect the
performance of your drive. If you do try to format your drive most standard low level
formatting programs will return a “Drive formatted” message very quickly. In fact, the
drive has not been formatted.