Some years ago, I've started using a very simple rule:
Save the result of fdisk -l into a text file after each disk/partition management
It is very simple, it takes very few time and it can save many hours avoiding awful situations and some times data loss.
If ever you lost a partition:
- start with a GNU/Linux LiveCD (e.g. Fedora)
- retrieve your fdisk output (in particular first and last cylinders, indicated under "start" and "end" columns)
- launch fdisk in interactive mode on the regarded device (e.g. /dev/sda)
fdisk /dev/sda
- restore missing partition using first and last cylinder (typing 'n' for new partition)- if needed, update the type of partition (typing 't' for changing partition' system ID; then 'L' to get the list of available codes)
- save changes (typing 'w')
If nothing has been written on the corresponding disk space, you will get back lost partition without data loss.
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