hellier@hadar.usc.edu (Chuck Hellier) (11/14/89)
Does anyone know just how files are managed by a SCSI drive controller? Specifically, how does one decide to place a new file on a drive (would the file be placed in the first open block, least recently used, most recently used)? Is the allocation method: _contiguous_, _linked_, or _indexed_? And how is the disk scheduled (FCFS, SSTF, SCAN, ...)? The reason I bring this up is: I know someone who has an SE (with an Apple HD20) who had a file named "X" on his HD20 and a *different* file named "X" on a floppy. He copied the file "X" off of the floppy to the HD20, "replacing" the file that was already there. He needs to recover the "X" that was originally on the HD20. I'm already working on the recovery; don't need help with that. I just wanted to know if someone out there knew what happened (on the hardware level) on his HD20. Chuck Hellier (hellier@skat.usc.edu) For you are young and life PC Systems Programmer is long and there is time University of Southern California to kill today.
hellier@skat.usc.edu (Chuck Hellier) (11/15/89)
Does anyone know just how files are managed by the Mac OS? Specifically, how does it decide to place a new file on a drive (would the file be placed in the first open block, least recently used, most recently used)? Is the allocation method: _contiguous_, _linked_, or _indexed_? And how is the disk scheduled (FCFS, SSTF, SCAN, ...)? The reason I bring this up is: I know someone who has an SE (with an Apple HD20) who had a file named "X" on his HD20 and a *different* file named "X" on a floppy. He copied the file "X" off of the floppy to the HD20, "replacing" the file that was already there. He needs to recover the "X" that was originally on the HD20. I'm already working on the recovery; don't need help with that. I just wanted to know if someone out there knew what happened (on the hardware level) on his HD20. Chuck Hellier (hellier@skat.usc.edu) For you are young and life PC Systems Programmer is long and there is time University of Southern California to kill today.