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computers / comp.sys.tandy / MM CP/M with 35 Mb Hard Drive?

SubjectAuthor
* MM CP/M with 35 Mb Hard Drive?Tom Lake
`- Re: MM CP/M with 35 Mb Hard Drive?Bob Campbell

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MM CP/M with 35 Mb Hard Drive?

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Subject: MM CP/M with 35 Mb Hard Drive?
From: tla...@twcny.rr.com (Tom Lake)
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 by: Tom Lake - Sat, 22 Apr 2023 17:35 UTC

I have Montezuma Micro CP/M on a Tandy Model 4D. I can boot from a 15 Mb hard drive but when I try to partition and format a 35 Mb drive using Montezuma's HDRS35M.COM, the fourth partition always errors out at track 512. CP/M is limited to four partitions of 8 Mb each on a single hard drive so I could fit all four partitions on a 35 Mb hard drive and still have about 3 Mb left for another OS such as LS-DOS.

Can anyone tell me what parameters I can use? The following should work but doesn't:

HDRS35M H=ABCD F=EFGH INIT

Re: MM CP/M with 35 Mb Hard Drive?

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Subject: Re: MM CP/M with 35 Mb Hard Drive?
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 by: Bob Campbell - Mon, 24 Apr 2023 04:08 UTC

Tom Lake <tlake@twcny.rr.com> wrote:
> I have Montezuma Micro CP/M on a Tandy Model 4D. I can boot from a 15 Mb
> hard drive but when I try to partition and format a 35 Mb drive using
> Montezuma's HDRS35M.COM, the fourth partition always errors out at track
> 512. CP/M is limited to four partitions of 8 Mb each on a single hard
> drive so I could fit all four partitions on a 35 Mb hard drive and still
> have about 3 Mb left for another OS such as LS-DOS.
>
> Can anyone tell me what parameters I can use? The following should work but doesn't:
>
> HDRS35M H=ABCD F=EFGH INIT

How many cylinders does the drive have? Does it have 2048? Does it work
with only 3 partitions instead of 4? Perhaps the last cylinder is actually
bad. Would not be surprising for a 40 year old drive.

I have no experience at all with CP/M on a Model 4. LDOS/LS-DOS allows
you to specify the cylinder count for each partition. Can you do that with
CP/M?

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