On Sat, 29 Sep 2001 09:48:41 +0100, Joerg Dietze wrote:
> Hi Sam,
> On Sat, 29 Sep 2001 00:01:54 -0500, Samuel W. Heywood wrote:
>> Hello:
>> I have a problem.
>> Problem:
>> I have WIN95 installed in two computers.
>> To some people that alone might count as two problems, both of which
>> could easily be solved by "DELTREE WINDOWS", but then I would still
>> have two problems in that they would both be running MS-DOS 7.00
>> instead of a good version of DOS.
>> What I really want to do is to boot the computers with DR-DOS 7.02
>> from the A Drive. When I do this with one of my two computers the
>> hard drive isn't recognized. ("Invalid drive specification" error)
>> I don't know what the problem is with the computer whose hard
>> drive can't be recognized by DR-DOS. Whatever the problem is, it has
>> nothing to do with the BIOS date or the hard drive size.
>> I have a Toshiba Satelite Pro laptop with a BIOS date of 2/26/99 and
>> an 810 MB hard drive. The drive is not partitioned into separate
>> logical drives. My hard drive will be recognized when I boot
>> from the A drive by using a WIN95 boot disk. (MS-DOS 7.0) If I use
>> a DR-DOS 7.02 boot disk my hard drive will not be recognized.
> with older BIOSes, the drive/partition which is booted from has to be
> smaller than 512 MB (must be within first 1023 cylinders).
In this case the drive that it is booted from is A. When I boot
from A with DR-DOS 7.02 and then try to access C, I get an invalid
drive specification. Using the older computer with the older BIOS
I can use the same DR-DOS boot disk to boot from A. When I try to
access C I have no problem, even though it has a larger hard drive.
Both computers will recognize C if I boot from A using a WIN95
system disk.
>> Also I have a Monorail Model 133 having a BIOS date of 7/15/95 and
>> a 2.2 GB hard drive. This drive likewise is not partitioned into
>> separate logical drives. On this computer my hard drive will be
>> recognized when I boot from the A drive with either a DR-DOS 7.02
>> boot disk or a WIN95 boot disk.
>> I have always been told that DOS has problems recognizing large hard
>> drive partitions if the machine has an old BIOS. Various DOS
>> versions also have different limitations as to the maximum size hard
>> drive partition it can recognize. In the case in point, the machine
>> having the newer BIOS and the smaller hard drive will not recognize
>> its hard drive when booted to DR-DOS 7.02 from the A drive. How can
>> this be, and how can I fix the problem?
> Try to install a diskmanager, like Ontrack. This will eat up ca. 1k of
> conventional memory. It will install some kind of BIOS extension to fix
> the problem. I did run such stuff with an old 486 and a 6 G HD.
Why should I install a BIOS extension on the computer having the newer
BIOS? There is no problem in recognizing C with the older computer,
even though it has a larger hard drive.
I'm still just as puzzled.
Sam Heywood
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