Re: Oddity with DOS Partitions/Swapping

[Goran Koruga]

On Thu, Nov 23 2000, Mark Bober wrote:

Hi,

I am not quite sure if I understood what you want but ...

> I've searched through the archives and google, couldn't find anything 
> relevant, so here goes:
> 
> Using GRUB 0.5.96.1
> 
> I've listed 'fdisk -l' output at the end of the message. I've got a 10gig 
> drive, mostly linux with one FAT32 partition, on the primary master. On the 
> secondary master, I have a 4 gig, with a 700meg FAT32 partition as primary, 
> and the rest being a logical DOS FAT32 partition.
> 
> My boot sequence to get to windows is like this:
> title WinME
> root (hd1,0)
> map (hd0) (hd1)
> map (hd1) (hd0)
> makeactive
> chainloader +1
> boot              
> 
> As you can see I'm using Windows ME. Now, what I'd expect to see is:
> 
> C:    (hdc1, or the primary partition on the 4 gig)
> D:    (hda2, or the primary FAT32 partition on the 10 gig)
> E:    
> 
> What I get under Windows Explorer is this
> 
> C:    (hdc1, or the primary partition on the 4 gig)
> D:    (hda2, or the primary FAT32 partition on the 10 gig)
> E:    
> F:    (hdc5, or the logical partition on the 4 gig)
> 
> Drive E: is the problem - it seems to be the "extended partition marker" on 
> the 4 gig drive. For grins, I formatted it, and I had E: and F:, they were 
> the *exact* same drive, just different data. I marked the new 'E:' drive with 
> a text file, rebooted, that text file (and partition) moved to 'F:', and E: 
> was once again this blank, unformatted, fake partition.
> 
> DOS's FDISK shows this:
> 
> Drive Partition               Type            Label           Size
> C:    1               PRI-DOS REAL-ME 700
>             2         EXT-DOS -               3404
> 
> Logical Drive Screen:
> 
> E:                    Unknown                 3404
> 
> FDISK doesn't see F:, and shows E: as unformatted. but Windows Explorer does 
> see F:, as formatted. The partitioning of the 4 gigabyte was done with 
> WinME's FDISK, so was the formatting. If I unplug my 10 gig, and boot 
> 'native' to Windows, it doesn't see this blank partition. Is there something 
> more I need to do in grub to get that extended partition to not show up to 
> Windows?

GRUB has hide command. Use it like this :

hide {partition}

This is from user-ref.texi file :

Hide {partition} by setting the "hidden" bit in its partition
type code. This is useful only when booting DOS or Windows
and multiple primary FAT partitions exist in one disk.  

Regards,
Goran
> 
> Thanks!
> 
> Mark
> 
> (yes, I realize that making one partition is easier, but my plan was to have 
> a 700 meg partition under VMWare, that I could doubly install apps to without 
> screwing up the hardware configuration of the original Windows install (I 
> still like my Windows games)
> 
> ** fdisk -l output **
> 
> Disk /dev/hda: 255 heads, 63 sectors, 1232 cylinders
> Units = cylinders of 16065 * 512 bytes
>  
>    Device Boot    Start       End    Blocks   Id  System
> /dev/hda1   *         1       732   5879758+  85  Linux extended
> /dev/hda2           733      1232   4016250    c  Win95 FAT32 (LBA)
> /dev/hda5             1        31    248944+  83  Linux
> /dev/hda6            32        94    506016   82  Linux swap
> /dev/hda7            95       603   4088511   83  Linux
> /dev/hda8           604       732   1036161   83  Linux      
> 
> Disk /dev/hdc: 255 heads, 63 sectors, 524 cylinders
> Units = cylinders of 16065 * 512 bytes
>  
>    Device Boot    Start       End    Blocks   Id  System
> /dev/hdc1   *         1        90    722893+   b  Win95 FAT32
> /dev/hdc2            91       524   3486105    5  Extended
> /dev/hdc5            91       524   3486073+   b  Win95 FAT32      
> 
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