ThinkPad T520: uefi/gpt based debian install
Am Freitag, 13. Mai 2011 schrieb Martin Steigerwald:
> I am about to receive a ThinkPad T520 with Intel SSD 320 real soon
> I wondered whether it might make sense to install with UEFI and GPT.
> Informations from Arch Wiki hint at that for better alignment and less
> space waste for SSD:
> Did anyone here try this with any laptop with uefi BIOS? Did it work?
> Were there problems? I have seen some Debian bug reports that were
Just for the record. The ThinkPad BIOS Version: 8AET42WW (1.22 ), didnīt
like to boot from a GPT partitioned SSD with BIOS Boot Partition and EFI
System Partition. I made the latter just for the case I want to switch to
EFI later on, but let grub-pc install to the BIOS Boot Partition.
Even after switching to MBR it didnīt work. Only after I zerod sector 2 to
2047, the BIOS Boot Partition and the EFI System Partition and set the
partition /boot bootable the BIOS booted from the SSD again. I do not
think it was the bootable flag.
Maybe it was the EFI System Partition, but I also tried after removing it
in gdisk. A parted mklabel msdos which should wipe the pre-existing GPT
headers did not suffice.
So the exact circumstances why it didnīt work are unknown to me, but I now
stick to MBR for the while being. Doesnīt matter anyway, as fdisk -cu also
aligns at 1 MiB and displays partitions offsets and sizes in sectors.
Well I saw an report that it doesnīt work with a ThinkPad W520 as well.
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
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