I just googled error codes (http://www.ed.psu.edu/etc/mac/errors.html) and got this pithy description of -36, "ioErr" which doesn't tell me anything but seems to suggest imput-output error. Whatever that is. . . There used to be file size limits in older Mac OS's but I can't imagine 6 gigs would be a problem now. I'm guessing that you have a corrupted file that for reasons beyond me, is too damaged for the finder to copy from one drive to another. Since it's always the same 4 gb spot of the file that it glitches on, I'm guessing that as you watch it, you'll find a glitch in the video around the 2/3rds mark. As a prior post suggested, maybe you can split the file before and after the glitch and copy it over in two parts. A workaround is to compress the file into a stuffit file and see if it'll copy over that way. Alternatively you can try puting the file into a disk image of it and see if it'll transfer. (dunno if the OS makes a disk image that big). Lastly, find a copy of the program Carbon Copy Cloner and use that to transfer the file. . . Good luck! On Feb 15, 2005, at 4:26 PM, KathyMac! wrote: > I have several .mov files on my hard drive as well as my firewire > drives. These files are about 6gb. > I cannot copy them from one drive to another. Every single time it > stops at the 4gb mark with the error code of -36 and the message "The > finder cannot complete the operation because some data in 'clip.mov' > could not be read or written". > > No matter which drive I use. I have swapped 3 firewire drives, changed > cables, used 3 different internal hard drives on my G4. Then the > problem is the same when I take it to the G4 iMac with other firewire > drives.