When write()ing to a raw device, what is known on return?

[Hans J. Albertsson]

[]
When a write to a raw disk partition returns, is anything known
concerning whether data is actually on the disk or not?

I know, I can read the source code, but, still, I'd like to know in
general terms. Does UNIX in itself guarantee that data is actually on the
disk?


-- 
 Two's complement, but three's an int....
Hans Albertsson EIS, USENET/uucp: ...!mcvax!enea!log-hb!hans