mount (8) - Página man do Linux
Return Codes
mount has the following return codes (the bits can be ORed):
0: success
1: incorrect invocation or permissions
2: system error (out of memory, cannot fork, no more loop devices)
4: internal mount bug
8: user interrupt
16: problems writing or locking /etc/mtab
32: mount failure
64: some mount succeeded
Isso sugere que você gerou 3 erros:
- interrupção do usuário
- bug de montagem interna
- invocação ou permissões incorretas