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List:       soekris-tech
Subject:    Re: [Soekris] comBIOS ver. 1.33 sees wrong disk size
From:       Landon Curt Noll <soekris-mail () asthe ! com>
Date:       2011-07-21 21:19:48
Message-ID: 3CE4E11B-742D-4265-B101-29B4220E3A72 () asthe ! com
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Hello Darryl,

On 2011-Jul-21, at 02:50, Darryl Miles wrote:

> 
> 
> Thanks for your reply.
> 
> 
> Landon Curt Noll wrote:
> > Here is what fdisk says about one of our cf drives:
> > 
> > 	Disk /dev/sda: 16.4 GB, 16391208960 bytes
> > 	255 heads, 63 sectors/track, 1992 cylinders
> > 	Units = cylinders of 16065 * 512 = 8225280 bytes
> > 	Sector size (logical/physical): 512 bytes / 512 bytes
> > 	I/O size (minimum/optimal): 512 bytes / 512 bytes
> > 	Disk identifier: 0x0003cd75
> > 
> > On that system the /boot partition is about 25 cylinders long.
> > 
> > 	Device		Boot	Start	End		Blocks		Id	System
> > 	/dev/sda1	*		1		25		194560		83
> > 	Linux Partition 1 does not end on cylinder boundary.
> > 	/dev/sda2			25		1993	15809537	5	Extended
> > 	/dev/sda5			1906	1993	700416		82	Linux swap / Solaris
> > 	/dev/sda6			25		1906	15109120	83	Linux
> > 
> 
> I can do the same but need to make sure all the data is within that first 8Mb then \
> everything is fine.

We just tested a setup were we forced the data into the last cylinder ... nearly 200 \
MBytes from the start of the drive. It does not work if the data is spread across the \
entire 16 GByte drive.  There is a "semi-magic" limit somewhere between 200 MBytes \
and 16 GBytes for our setup.

We are not seeing an 8MByte limitation.  There may be a difference between CF cards \
where that matters.

chongo () /\oo/\

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