hash issues

Hi all,
Having issues getting cudahashcat to love me, an approximation of my hash is below, along with the corresponding error message.

the hash is from the first : (colon), to the next one, the $1$ I would think is -m 500, but l've also tried 20, 1500 or anything else I can think of.. It's a slax root pwd on a penetration practice disk..

Any help/advise appreciated greatly...


this is root.hash..

$1$xxxxxxxx$j3obHaAlUdMbHxxxxY5Dq0


cudahashcat64 -m 500 -a0 root.hash /root/dict/rock410.txt -o recovered.txt
cudaHashcat v1.31 starting...

WARNING: Hash 'root.hash': Signature unmatched


ERROR: No hashes loaded