Sharp MZ-5500 - Ral Descr Iption

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8. llard disk interface general description
Any of the MZ -S500/S600 series can be interfaced with the hard disk that hns
a formatted capacity of 10.7 B (one unit is equipped standard for the
MZ-5645). Especially in the HZ-564S; a mClximum of two hard disks can bC'
installed via the internal . hard disk interface.
HZ-5631/5641
MZ-564S (with an internal
10.7HB hard disk drive)
HZ-~~ll /2521 _ _ ~ _____ __
MZ-IFIO*
(with the hard disk interface)
MZ-IFI8* (without the hard disk interface)
~J1Z-1FIO* (with the hard disk interface)
*MZ-IF18 is equipped with the drive unit only.
The HZ-S500/560b hard disk has four disk recording surfaces as shown in
Fig.8-1 and each surface consists of 320 tracks developed along th e rfldius
of the disko Track numbers, 0 to 319, are assigned and sector numbers,
I to 17, are assigned, to represents the specific location with the track
number, sector number, and head number (0 to 3).
Fig.8-1 also shows the soft sector. In the 10 field is contained the s ecto r
address information (track, head, sector) which is normally used to acc e ss
the specified sector.
For better reliability, retrial i6
made possible. If recovery was not
J "" -'- ~CII ~
DiSK :' 7(1)
successful with retrial, correction
(ECC) is automatically carried out
to a burst data of up to eleven bits.
In addition to it, alternate track
is provided on Track 0 or Track 1 to
permit to replace data or program by
a
whole sec tor, in case there i9 an
It"lQ.)(
P\.(\$~
unrecoverable damage in the disk such
- Tr(ll ~ 0
as a physical disk damage.
So, tracks actually usable are 317
'ru( ~ \
tracks of track number 2 to 318, with
the track number 319 being used for.
the test of the hard disko The ID
field, however, cannot be created
by the user.
Fig.8-1 Disk and so[twClre sec tor
example (physical)
11
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