[LinuxBIOS] 2 Terabyte Limit of BIOS/MBR
duwe at lst.de
Fri Jan 11 01:21:35 CET 2008
On Thursday 10 January 2008, Martin Marcher wrote:
> the BIOS just can't handle disks that are larger than 2TB, in
In theory a legacy BIOS should be able to at least access the first 2TB. The
limit stems from 512 bytes block size and counting blocks in 32-bit integers,
which is done in a classic DOS disk label, in the MBR.
> Fine so I convert the disk to a GPT and
> off I should go.
Does your legacy BIOS support GPT? unlikely.
> OK, now the actual question(s):
> 1) Is this problem (if I understood it right) still there with linuxbios?
LinuxBIOS itself isn't directly considered with disks besides initialising the
controller. Look at the section "Payloads" in the wiki. Most of them are open
source, BTW 8-)
> 2) If so what plans are there to still be able to use a >2TB disk?
Make a DOS (legacy BIOS) _partition_ of small size to boot from, at the start
of the disk. Make sure it's consistent with the GPT label. If that does not
help, you _need_ LinuxBIOS and a capable payload, or a guru boot setup.
> 3) Last, not least I couldn't the Tyan GT20 in the supported hardware list,
> is that true or just missing.
Tyan is LinuxBIOS-friendly, behind the scenes, if the 2865(?) board is not
supported maybe there's a way (the S2912 is supported).
> If it's missing I'll bug Tyan about this once a month or so, in case you
> don't have the specs available to send it to you (if you want me to do
Anyone here ready to do the port?
> apologies if that is totally OT but I think I'm right here :)
Not with questions about legacy BIOSes, but with datasheets you are ;-)
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