On 6/12/22 09:18, Antony Stone wrote:
On Sunday 12 June 2022 at 17:11:45, Fred wrote:
Hello,
I have some directories I want to back up to an SD card while preserving
the permissions. I have tried to repartition a 64GB card and write an
ext4 filesystem.
What is the existing partition table?
Out of interest, since this is ext4 and therefore Linux (not Windows), why
partiton at all? Why not just "mkfs.ext4 /dev/sdX"?
fdisk says the card has 124702720 sectors and has 59.5GB available.
However it will not make a partition over 27.5GB. Why and what to do?
What's the output of "fdisk -l /dev/sdX"?
Have you tried wiping the partition table and creating a new one?
dd if=/dev/zero of=/dev/sdX bs=10M count=10
Then use fdisk as usual - it will prompt you to create a new table.
Antony.
Hi,
As supplied the SD cards are intended to work with Windows. Under Linux
only root can write to them and the ownership can not be changed. I
want preserve permissions of data written to the card.
root@aragog:# /sbin/fdisk -l /dev/sdb
Disk /dev/sdb: 27.48 GiB, 29504831488 bytes, 57626624 sectors
Disk model: Card-Reader
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: 0x00000000
Device Boot Start End Sectors Size Id Type
/dev/sdb1 32768 124735487 124702720 59.5G 7 HPFS/NTFS/exFAT
I don't know why the size is reported differently in two places. It is
a 64GB card.
I tried your dd command line and things have gone downhill as the 64GB
card is now only 27.4GB.
root@aragog:# /sbin/fdisk -l /dev/sdb
Disk /dev/sdb: 27.48 GiB, 29504831488 bytes, 57626624 sectors
Disk model: Card-Reader
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
I tried fdisk again with the same result.
root@aragog:# /sbin/fdisk /dev/sdb
Command (m for help): n
Partition type
p primary (0 primary, 0 extended, 4 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-57626623, default 2048):
Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-57626623, default
57626623):
Created a new partition 1 of type 'Linux' and of size 27.5 GiB.
Command (m for help): d
Selected partition 1
Partition 1 has been deleted.
Command (m for help): n
Partition type
p primary (0 primary, 0 extended, 4 free)
e extended (container for logical partitions)
Select (default p): e
Partition number (1-4, default 1): 1
First sector (2048-57626623, default 2048):
Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-57626623, default
57626623):
Created a new partition 1 of type 'Extended' and of size 27.5 GiB.
Any ideas?
Best regards,
Fred
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