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Re: [Mtools] Reading label from a large capacity memory card

From: Simon Large
Subject: Re: [Mtools] Reading label from a large capacity memory card
Date: Tue, 17 Feb 2009 10:45:32 -0000

Alain Knaff wrote:
> Simon Large wrote:
>> Alain Knaff wrote:
>>> Simon Large wrote:
>>>> But after putting that in the problem still remains. For my 8GB
>>>> memory card the XdfOpen() call succeeds and maxsize is set to
>>>> max_off_t_31, which seems to be where the limit lies.
>>> Under normal circumstances, XdfOpen() should only be used on floppy
>>> disks. The problem here is that it succeeds on a memory card, it
>>> should not. This is weird, as XdfOpen checks both that the use_xdf
>>> flag is set on the device descriptor, and that the geometry is
>>> compatible with XDF... Could you send me the (partition's) boot
>>> sector of that memory card?
>> The requirement to read the volume name went away, so I have not used
>> mtools for some time :-(
> No problem, my fault. I took indeed way too long to repond :-(
>> Further information - the card I was trying to read was actually
>> SDHC, not SD, although I guess that is obvious from the capacity. If
>> you are still interested I can extract the boot sector, but I will
>> need to dig out the system it was running on.
>> Pardon my ignorance (we're mostly a Windows shop here) but if you can
>> give me an appropriate 'dd' command line it will save me guessing and
>> sending you a file of useless garbage ;-)
> Assuming the card is on /dev/sda (first SCSI-like device), firs
> partition: 
> dd if=/dev/sda1 bs=512 count=1 of=bootsector.bin
> Replace /dev/sda1 as appropriate. (/dev/sdb3 for third partition on
> second SCSI-like device, etc.) 

Here are the boot sectors for 2 cards that I tried.
The 2GB card works OK and reports "Volume label is SIMON TEST".
The 8GB card reports "Big disks not supported on this architecture".

Using 3.9.11



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