Re: Wiping a disk partition
- Reply: Frank Leonhardt : "Re: Wiping a disk partition"
- In reply to: Odhiambo Washington : "Re: Wiping a disk partition"
- Go to: [ bottom of page ] [ top of archives ] [ this month ]
Date: Thu, 03 Jul 2025 21:20:31 UTC
On 6/25/25 03:16, Odhiambo Washington wrote: > root@gw:/home/wash # df -h > Filesystem Size Used Avail Capacity Mounted on > /dev/ada0p2 1.8T 552G 1.1T 33% / > devfs 1.0K 0B 1.0K 0% /dev > fdescfs 1.0K 0B 1.0K 0% /dev/fd > procfs 8.0K 0B 8.0K 0% /proc > linprocfs 8.0K 0B 8.0K 0% /compat/linux/proc > linsysfs 8.0K 0B 8.0K 0% /compat/linux/sys > /dev/ada1p2 1.8T 856G 802G 52% /disk2 On 7/3/25 02:24, Odhiambo Washington wrote: > What I did was: > > umount /disk2 > dd if=/dev/ada0 of=/dev/ada1 bs=1g status=progress If the computer was running in multi-user mode when you cloned ada0 to ada1, the root file system on ada0p2 will have been mounted read-write, any ada0 swap partition will have been active, and it is likely that foreground and/or background processes wrote to ada0 while cloning. The last means the source and the clone are not the same, and the backup is incorrect. If you want to clone ada0 to ada1, then you must boot into single-user mode or boot live media; so that ada0 does not change while cloning. After making the clone, verify by using cmp(1) to do a byte-for-byte comparison of the source and the clone. David