The crashed external WD USB HDD should be in transit back to Western Digital now. The new one is working fine, and I hope it doesn't crash soon!
Before packaging the bad HDD for return I wiped it clean to remove all data. Wiping process was:
- Write zeros on the whole disk: ~$ dd if=/dev/zero of=/dev/sdb
- Write random characters: ~$ dd if=/dev/random of=/dev/sdb
- Again write zeros on the whole disk: ~$ dd if=/dev/zero of=/dev/sdb
Later I realized that I could have also used shred, or after writing zeros I could have written some porn for WD as a gift ;). Maybe I will do that next time for them.