Hi Mick Mick wrote:
> On Sunday 31 Jul 2016 22:38:22 Jörg Schaible wrote: >> Hi Mick, >> >> Mick wrote: >> > On Sunday 31 Jul 2016 19:14:45 Jörg Schaible wrote: >> >> Hi Daniel, >> >> >> >> thanks for your response. >> >> >> >> Daniel Frey wrote: >> >> >> >> [snip] >> >> >> >> > I can only think of two reasons, the kernel on the livecd doesn't >> >> > support GPT (which is unlikely) >> >> >> >> That would be really strange. However, how can I prove it? >> > >> > If after you boot your systemrescuecd you can list: >> > >> > /sys/firmware/efi >> > >> > you have booted into UEFI mode. If not, you have booted into legacy >> > BIOS mode. >> >> This machine has only plain old BIOS. The question is, why one kernel >> detects the 3TB partition and the the other one does not. How can I prove >> GPT support for the kernel itself. > > > I see. In this case have a look at /proc/config (it may be compressed) or > depending on your version of sysrescuecd and kernel choice, have a look > here: > > https://sourceforge.net/p/systemrescuecd/code/ci/master/tree/ > > then compare your configuration to theirs. The kernel module for GPT is > 'CONFIG_EFI_PARTITION' and it must be built in, rather than as a separate > module. Now it's getting weird. My normal kernel (4.4.6) does not have that flag set. Nevertheless it detects the partition. The two kernels (both 4.4.12) of systemrescue have that flag. I've tested another machine with kernel that also has the flag and it does not detect this partition also. However, I have another 6TB USB drive and that one has one big partition that is detected by both machines. The funny thing is, it reports to have only a MBR with one partition of 6TB (same output on both kernels): ================== %< ====================== ~ # parted /dev/sde print Model: WD My Book 1230 (scsi) Disk /dev/sde: 6001GB Sector size (logical/physical): 4096B/4096B Partition Table: msdos Disk Flags: Number Start End Size Type File system Flags 1 8389kB 6001GB 6001GB primary ext4 ~ # gdisk /dev/sde GPT fdisk (gdisk) version 1.0.1 Partition table scan: MBR: MBR only BSD: not present APM: not present GPT: not present *************************************************************** Found invalid GPT and valid MBR; converting MBR to GPT format in memory. THIS OPERATION IS POTENTIALLY DESTRUCTIVE! Exit by typing 'q' if you don't want to convert your MBR partitions to GPT format! *************************************************************** Command (? for help): q ================== %< ====================== AFAICS this partition works fine, fsck does not report any problem. The funny thing is, it should not have been possible, because of the 2GB limit of MBR. ??? - Jörg
