pt dropping out of record

[alance]

Hi all. I've finally got my new imac g5 1.8. It''s been working well. I'm 10.3.5, 6.4cs9, 1.25 gig ram 250gig sata internal and fw400 external that's tried and true. I've been recording some cassettes for a friend. no problem. Then I get to one side and pro tools keeps dropping out of record about the same place(10 min in) each time. I still had 4 gigs left on the ext. drive. Open ended allocation. I switched over to the internal drive and that seems to have done it, but I'm still curious because I don't want it to happen during a critical session. While I got you, I have two other questions. On my laptop I have the mp3 option but have since lost the auth. code. Any ideas on how to retrieve it for the new computer? Anyone try 6.7 yet?