Dec 242017
Parks multiple dissimilar hard disks - like SHIPDISK but very fast!.
File NEWPARK.ZIP from The Programmer’s Corner in
Category HD Utilities
Parks multiple dissimilar hard disks – like SHIPDISK but very fast!.
File Name File Size Zip Size Zip Type
PARK.ASM 14284 1301 deflated
PARK.COM 663 306 deflated
PARK.DOC 1660 821 deflated
TPCREAD.ME 199 165 deflated

Download File NEWPARK.ZIP Here

Contents of the PARK.DOC file

PARK -- A new routine to park the heads of one or both fixed disks

The heads of fixed disks should be left in the parked position
whenever the drive is not in use, so that if the machine is jarred
or the power is dropped, the heads will land on an unused portion
of the platter. IBM provides a way to do this, but only in

Several BBSs have had PARK routines available for download, but
universally they handle only one hard disk and universally the
cylinder number at which the disk heads should be parked is hard-coded
in the program.

This PARK.COM routine determines, for either or both hard disks,
where to park the heads (by trying ever-higher cylinders until it
finds a cylinder number to which the disk cannot move), and leaves
the heads there. It does it separately for the first and second
drives, so that it is usable even in systems that have two dissimilar
hard disks.

An earlier version did the seeks one cylinder at a time; the current
version first moves 100 cylinders at a time, then 10 cylinders at
a time, and finally one cylinder at a time. On a Seagate 225 (612
cylinders, 4 heads, 20 megabytes), this reduced the time from an
intolerable half-a-minute to less than 1/2 second.

The files are: PARK.DOC this DOC file
PARK.ASM assembler language source
PARK.COM the executable module, obtained
by processing PARK.ASM with the
MASM, LINK, and EXE2BIN programs.

Carl Hayes (SYSOP, NN5I BBS, 214-960-2730)

 December 24, 2017  Add comments

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