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1987-12-26
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Installing a Miniscribe 3650 Hard Drive,
Using a Perstor 180 Controller
(or another RLL Controller)
* ------- by Jim Russ, Orlando, Florida, (305) 851-0705 -------*
OK, guys (and gals), listen up 'real' good... Here's a way to get AT
LEAST 77.9 Megabytes from a Miniscribe 3650 Hard Drive if you use it in
conjunction with a Perstor 180 Controller Board (available from Richard
Driggers, SYSOP of the Sparta BBS, voice 1-201-729-9409). Actually,
these half-height drives are sold as 40-Megabyte units, but they take to
RLL formatting and to the Perstor 180 board like a duck takes to water.
At only $314 each, I ordered two... the total was $628 for the drives
and another $8 for shipping, with the total outlay running $636! Sold
my two Seagate hard drives, recovering $500 of this cost, so my final
out-of-pocket expense was $136, and I now have over 155 Megabytes of
writeable hard disk space. (My supplier's address is on page 3.)
With this procedure, a Miniscribe 3650, and an Adaptec 2070A RLL con-
troller you can get nearly 63 megs of writeable space; when used with
a Western Digital or an OMTI RLL controller, you can format about 65.5
Megs, but the Perstor 180 will obtain 78 Megabytes PLUS a file transfer
rate of about 180 KB/Second! (Although I have yet to try it, a Perstor
200 board should be able to format the Miniscribe 3650 out to 85.6
Megabytes! If I get my hands on one, I'll try it out...hint, hint). And
all this WITHOUT the use of the Perstor compression and WITHOUT the need
to use the ONTRACK Disk Manager programs *. Heck, you can get well over
100 Megabytes on a single Miniscribe Half-height 3650 Drive if you opt
to run the Perstor Compression Software! (I tried this once, and ended
up with a total of 126+ Megs, but reverted to the procedure described
here as most of my files are already archived, and the tricky compres-
sion procedure gains me very little in its process.) * You'll need
DOS 3.2 or higher, otherwise you need ONTRACK Disk Manager!
First, open your computer (mine is an AT&T PC 6300). Replace your
existing controller with the Perstor 180. Next, install the Miniscribe
3650 in place of your existing hard drive (Seagate??). The striped
lead on both the 34-conductor and the 20-conductor ribbon cables must
be toward the REAR of the computer when connected to the Perstor card.
Although Miniscribe touts their 3650 as having 809 cylinders, I have
discovered that this drive can actually be formatted out to 820
cylinders, therefore Table 4, describing jumper settings for JMP6, as
listed on page 6 of the Perstor owners' manual shows the proper set-
settings. Just jumper (short) pins 3-4, 7-8, 13-14, and 15-16. This
will set you up not only for Physical Drive 0 (jumper 7-8), but for
another, later Physical Drive 1 (jumper 3-4).
Next, boot "Vanilla," using MS-DOS 3.2 or later (PC-DOS 3.2 or later
probably works, too...); you should also have FDISK.COM, FORMAT.COM,
CORETEST.EXE ( V E R Y important!), and Perstor's PS2FMT.COM available
for use after you have booted; for OTHER controllers, have DEBUG.COM for
the low-level format, using the addresses described in the literature
which comes with your RLL controller. (For your information, the address
to be used with an Adaptec 2070A RLL Controller is c800:CCC, for the
Western Digital RLL Controller, it is c800:5, and for the OMTI 5527A
Controller, it is c800:6. After executing DEBUG, you will receive a
- prompt; you just type in g=(address) and, generally, just follow the
prompts which are generated by the BIOS chip internal to your own
particular controller.)
As the interleave factor is important if you wish to optimize the
controller-computer interface for optimum (fastest) file transfer rate,
you will want to follow Richard Driggers' methodology for determining
the best interleave factor; his method is described below:
1. Boot "Vanilla."
2. Insert the diskette containing the PS2FMT program into the
A: drive. Type PS2FMT, then press <ENTER>.
3. As the default for your first run should be an interleave
factor of "4" just select that default on your first try,
and start the low-level format.
4. After about 1 1/2 minutes, place your boot diskette into
drive A: and press your reset button. Run CORETEST now
(never mind that the drive has not been high-level formatted;
CORETEST does not care, and will test it anyway). Record
the results.
5. REBOOT.
6. THIS time, select "5" for the interleave factor. Again,
run PS2FMT for 1 1/2 minutes, then reboot and run CORETEST,
again recording the results (probably will be higher).
7. Keep cycling through this procedure until the transfer rate
in KB/Seconds DROPS. Then, back up to the LAST interleave
factor you selected and low-level the ENTIRE disk with that
interleave. (In my case, "5" was the optimum... )
8. If the format program encounters any bad sectors during the
low-level format, it will display the track and head numbers.
You should carefully monitor this entire procedure, and when
prompted to do so enter these data so those tracks will be
marked as bad...
9. Next, figure out how large you want each of your partitions
to be... This can be calculated very simply with the fol-
lowing formula:
GENERIC: Cylinders X Heads X Sectors/Cylinder X 512 bytes =
Writeable Bytes
Perstor 180 with
Miniscribe
3650: 820 X 6 X 31 X 512 bytes =
* 78,090,240 Bytes
* As this is too large to be recognized as a single drive (DOS
limits you to 32 Megabytes per partition), you must make your
partitions no larger than 351 cylinders each (on the
Miniscribe 3650)... In my case, I elected to use 273
cylinders each for two partitions plus another partition for
the remainder. The first partition became my DOS partition
(drive C), and the remaining two became DOS DATA partitions
(drives D & E). IF you add a second Miniscribe 3650, ALL of
partitions must be DOS DATA partitions!
10. Run FDISK, then partition the drive in the way you have
selected. Be SURE to make partition #1 (DOS) Active before
backing out of the FDISK program.
-2-
11. REBOOT.
12. At the A: prompt, type FORMAT C: /S and press <ENTER>, then
answer Y when the warning that all data on the hard drive
will be lost. Let the format proceed.
13. Next, type FORMAT D: and press <ENTER>, again answering Y
at the warning.
14. Type FORMAT E: and press <ENTER>, again answering Y at the
warning.
(15. If you created four [maximum under DOS 3.2] partitiions, then
you should format that partition as well, as the F drive.)
Throughout all of this, I have presumed that you are using a
Perstor Controller. If not, then you will have to substitute the DEBUG
command for the PS2FMT command, using the address peculiar to your own
controller, and trying the low-level format with different interleave
factors as shown above. Most RLL controllers allow deviation from the
"standard" interleave factors; however, some are inflexible. Just hope
yours will allow you to select the optimum factor for interface with
your own computer.
If all has gone well during this procedure - and you were using the
Perstor 180 controller card - you should now have one bootable DOS drive
and two DOS DATA drives with a total writeable space of arou