The sfdisk utility does not allow us to change any extended partition type to
another extended type:
# sfdisk --list /dev/nbd0
Disk /dev/nbd0: 66 GiB, 70866960384 bytes, 138412032 sectors
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: 0x006bf65f
Device Boot Start End Sectors Size Id Type
/dev/nbd0p1 * 2048 999423 997376 487M 83 Linux
/dev/nbd0p2 1001470 138412031 137410562 65,5G 5 Extended
# sfdisk --part-type /dev/nbd0 2 0x85
Extended partition already exists.
lt-sfdisk: /dev/nbd0: partition 2: failed to set partition type
But why? As far as I understand, this is done in order to avoid more than one
extented partition on MBR disk (because MBR doesn't support more). But since
extended partition there are three types:
#define IS_EXTENDED(i) \
((i) == MBR_DOS_EXTENDED_PARTITION \
|| (i) == MBR_W95_EXTENDED_PARTITION \
|| (i) == MBR_LINUX_EXTENDED_PARTITION)
It would be nice to have the option to change the type of an existing extended
partition.
Pavel Butsykin (1):
libfdisk: allow to change an existing extended partition
libfdisk/src/dos.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--
2.11.0
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