Q: WD Caviar AC2700 - Installation question

Q: WD Caviar AC2700 - Installation question

Post by Erwin Gili » Tue, 13 Dec 1994 17:33:23



< on discussion about Western Digital WD2700 disk, the software delivered
with this disk and the possibility to use multiple operating systems
on this disk at the same time >


Quote:>It is only necessary to use Disk Manager if the system BIOS does not
>support CHS-to-CHS translation. CHS-to-CHS translation works by
>reducing the cylinder count and increasing the head count by the
>approriate amount. e.g., the Western Digital AC31000 drive has
>2,100 cylinders, 16 heads, and 63 Sector per Track. A CHS-to-CHS
>translating BIOS would convert this to 525-64-63. For the AC2700,
>which has 1,416-16-63, the translation will produce a CHS of
>708-32-63.
>Keep in mind that Disk Manager is a "DOS-only" solution. It will not
>work for OS/2, Windows NT, or and flavor of Unix (e.g., Linux).

Thanks for replying in this forum as a WD rep.

I thought that the 'max 1024 cylinders boundary' was a "DOS-ony" problem.
I'm amazed that it didn't work with windows NT, as indicated by a previous post
in comp.sys.ibm.pc.hardware.storage by Peter Mott.  

Should it be a problem for Linux?

I also have the WD2700 disk and do not have any problems with it. I think
there is no problem in installing Linux in such a way that you can acces
the whole drive. Or have one < 1024 cylinders DOS partition and use
the rest for Linux. This way, you don't need the tricky WD software at all.
I have a 250 Mb DOS and 450 Mb Linux partition now. Linux's fdisk reports
the inconsistensy between the logical and physical number of cylinders, but
everything seems to work fine otherwise.

BTW: In our department we've bought two 1 Gig Seagate drives. These drives
split themselves in two and act as two 500 Mb drives instead.
No problems here whatsoever, even DOS is satisfied. Nice solution.


> I'll bet I can manually massage the partition table to indicate the
> correct partition sizes, but isn't the table protected by some sort of
> checksum?
> Any suggestions for how I might get NT to recognize the full capacity
> of this drive?

What about using Linux fdisk to edit the partition table?  You can even run
it from floppy. It can do all kinds of neat things DOS fdisk wouldn't dream
of...

Erwin Giling

p.s. Peter, how is the Matlab for Linux port going ??  ;-)

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Erwin J.M. Giling                    |


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Q: WD Caviar AC2700 - Installation question

Post by Peter Mo » Wed, 14 Dec 1994 06:36:50


: BTW: In our department we've bought two 1 Gig Seagate drives. These drives
: split themselves in two and act as two 500 Mb drives instead.
: No problems here whatsoever, even DOS is satisfied. Nice solution.


: > I'll bet I can manually massage the partition table to indicate the
: > correct partition sizes, but isn't the table protected by some sort of
: > checksum?
: > Any suggestions for how I might get NT to recognize the full capacity
: > of this drive?

I finally have access to the full capacity of my ac2700 from NT and
apparently from DOS. To get this I had to blow away the partition
table (and who knows what else.) I did this by reinstalling the DISK
MANAGER software. (I gave up on manual manipulation for lack of a good
DISK editor and enough knowledge of what to tweak.) Then, I performed
a boot floppy assisted CDROM installation of NT to the point of
setting up partitions. At this point I could see the full capacity of
the drive. This had not been true when leaving the standard DOS
partitions in place. I partitioned the drive into 3 segments, 250Mb,
250Mb, the rest. I then boot a DOS floppy and formatted the
partitions. My understanding is fuzzy here because FDISK could see all
three partitions and I seemed to succeed at formatting all three.

What I learned is that if DOS FDISK is used to create the first FAT
partition on this device, the incorrect geometry is reported to NT
when it comes along.

So far I have been unable to install NT to either the second or third
partitions, but I can't point a finger at the problem yet. The symptom
is a message saying that 'ntoskrnl.exe' (sp) is corrupt or missing. It
is not missing and it compares without error to the copy on the CDROM.

I'll be trying an installation to the primary partition and my SCSI
disk this evening.

: What about using Linux fdisk to edit the partition table?  You can even run
: it from floppy. It can do all kinds of neat things DOS fdisk wouldn't dream
: of...

Good idea. I like tools. Where do I get it? I don't have LINUX yet.

: Erwin Giling

: p.s. Peter, how is the Matlab for Linux port going ??  ;-)

I like this issue, but I can't address it. Sorry.

: ================================================================================
: Erwin J.M. Giling                    |


: P.O. Box 5046                        | Phone     : +31-15785188
: 2600 GA  DELFT - The Netherlands     | Fax       : +31-15625403              
: ================================================================================

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 +----------------------------------------------------+
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 +----------------------------------------------------+

 
 
 

1. HARD DRIVE WD CAVIAR AC2700 (LILO)

Hello, I need help to install LILO and to
have the same physical/logical address for
my partitions.

Message from fdisk :
====================
Disk /dev/hda1 : 16 heads, 63 sectors, 1416 cylinders
Units = cylinders of 1008*512 bytes.

..

/dev/hda1   *    1     1     508    256000+   6   Dos 16-bits >32M
/dev/hda2      509   509     813    153720   83   Linux Native
/dev/hda3      814   814    1321    256032   83   Linux Native
Partition 3 has different physical/logical endings :
    phys=(1023,15,63) logical=(1320,15,63)
/dev/hda4     1024  1322    1415     47376   82   Linux Swap
Partition 4 has different physical/logical beginnings :
    phys=(1023,15,63) logical=(1321,0,1)
Partition 4 has different physical/logical endings :
    phys=(1023,15,63) logical=(1414,15,63)
Partition 4 does not start on cylinder boundary :
    phys=(1023,15,63) should be (1023,0,1)

Some information more :
=======================
I have installed the Linux system on the /dev/hda3
I have a unique harddisk Western Digital Caviar AC2700 (CMOS 696.9M)
and the Goldstar VL-Bus IDE & Super I/O..

Problems and questions :
========================
I have tried to install manually LILO wihtout success. The system is
always starting from DOS.
Can I do some think to change the physical address of one partition ?

Where is the mistake in general ?????

Thanks a lot for your attention.

Best regards,

Benoit Beck.


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