Hi, recently I switched from the old MBR-scheme to GPT on my new PC.
I have two external USB-harddisk, which were partioned/formatted with a MBR-scheme/MSDOS partition (but were never used to boot from. They are pure data containers). When I connect these to my new PC, only the device is shown: /dev/sdb, /dev/sdc. The kernel is configured (beside other things) as follows: # # Partition Types # CONFIG_PARTITION_ADVANCED=y # CONFIG_ACORN_PARTITION is not set # CONFIG_AIX_PARTITION is not set # CONFIG_OSF_PARTITION is not set # CONFIG_AMIGA_PARTITION is not set # CONFIG_ATARI_PARTITION is not set # CONFIG_MAC_PARTITION is not set CONFIG_MSDOS_PARTITION=y # CONFIG_BSD_DISKLABEL is not set # CONFIG_MINIX_SUBPARTITION is not set # CONFIG_SOLARIS_X86_PARTITION is not set # CONFIG_UNIXWARE_DISKLABEL is not set # CONFIG_LDM_PARTITION is not set # CONFIG_SGI_PARTITION is not set # CONFIG_ULTRIX_PARTITION is not set # CONFIG_SUN_PARTITION is not set # CONFIG_KARMA_PARTITION is not set CONFIG_EFI_PARTITION=y # CONFIG_SYSV68_PARTITION is not set # CONFIG_CMDLINE_PARTITION is not set # end of Partition Types CONFIG_BLOCK_COMPAT=y CONFIG_BLK_MQ_PCI=y CONFIG_BLK_MQ_VIRTIO=y CONFIG_BLK_PM=y dmesg shows this: [14617.672363] usb 2-2: New USB device found, idVendor=1058, idProduct=25a2, bcdDevice=10.21 [14617.672364] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [14617.672364] usb 2-2: Product: Elements 25A2 [14617.672365] usb 2-2: Manufacturer: Western Digital [14617.672366] usb 2-2: SerialNumber: 575844314132383959393934 [14617.681660] usb-storage 2-2:1.0: USB Mass Storage device detected [14617.681737] scsi host10: usb-storage 2-2:1.0 [14618.725450] scsi 10:0:0:0: Direct-Access WD Elements 25A2 1021 PQ: 0 ANSI: 6 [14618.725594] sd 10:0:0:0: Attached scsi generic sg1 type 0 [14618.728090] sd 10:0:0:0: [sdb] Spinning up disk... [14619.748918] ...ready I tried different USB ports in a desperate hope of success... ...no, same problem. Interestingly fdisk shows the following: host> sudo fdisk -l /dev/sdb Disk /dev/sdb: 931.49 GiB, 1000170586112 bytes, 1953458176 sectors Disk model: Elements 25A2 Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x16f2a91f Device Boot Start End Sectors Size Id Type /dev/sdb1 1 1953458175 1953458175 931.5G ee GPT The type is shown as GPT...but the drive has a MSDOS partition table. Reading my (old) internal harddrive with an external USB docking station is possible without any problems, though. Unfortunatelu I have no space for 1T image of that drive -- otherwise I would have made an image copy and experiment with that. So better ask, than sorry.... ;) Is this fixable or did I lost my backups? Cheers! Meino
