[ubuntu-it] errore 18

[Carlo Augusta]

On 3/16/07, alessandro soprana <alessandrosoprana a tiscali.it> wrote:
>
> valdagno, 16.03.07
>
> da qualche giorno il programma fa fatica a partire, si impalla sulla
> prima schermata di caricamento di ubuntu o, come ieri al "grub loading"
> mi dà errore 18.
> Se poi riesco a farlo partire dopo 5 minuti o poco più si blocca.
> qualcuno ha già avuto l'esperienza?
> alessandro soprana (utente finale ovvero cretino informatico)
>

Cercando su internet :
http://wiki.linuxquestions.org/wiki/GRUB#Error_18
Error 18

*Error 18: Selected cylinder exceeds maximum supported by BIOS*
This error is returned when a read is attempted at a linear block address
beyond the end of the BIOS translated area. This generally happens if your
disk is larger than the BIOS can handle (512MB for (E)IDE disks on older
machines or larger than 8GB on others.). In more practical terms this means
the BIOS is unable to start executing the kernel because the kernel is not
located within the block it can access at boot up time.

This can be circumvented by creating a boot partition at the beginning of
the disk that is completely within the first 1023 cylinders of the
harddrive. This partition will contain the kernel.

The kernel it self does not suffer from the same limitations as the BIOS so
after the BIOS has loaded the kernel the kernel will have no problem
accessing the whole harddrive. Newer BIOSes will automatically translate the
harddrives size in a way that it can be completely contained within the
first 1023 cylinders and hence modern computers do not suffer from this
problem.
The same error can happen when the BIOS detects a disk in a different way as
Linux does. This can happen when changing motherboards or when moving a
GRUB-bootable disk from one computer to another. If this happens, just boot
with a GRUB floppy, read the C/H/S numbers from the existing partition table
and manually edit the BIOS numbers to match. If using a SUSE linux and
installing on VM Ware this problem is solved by creating a small partition
at the very beginning of the harddisc, and mounting it as /boot.
-- 
Carlo Augusta
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