Corruption in large file copies to USB - Win 7 Pro 64bit SP1
I've seen other people have posted this problem, but I haven't found an answer.
When I copy large (1GB+) files from one hard disk to another (connected to the same computer), and the destination hard disk is on a USB3 port (also maybe USB2), sometimes the file becomes corrupted somewhere towards the end. Usually, the copy is fine
for 60-80% of the length but then the rest appears to be totally random data.
If I copy the same file over and over again between the same two drives, usually, I continue to get corrupt copies (but not at the same spot).
If I copy the files to a different destination drive, usually the problem goes away.
I've tried using the COPY command from the command prompt, same problem.
I've tried putting the source drive on a USB2 port so the copy goes much slower, still getting corruption.
I've run a RAM test for 6 hours with no problems found.
I tried running a "Linux" OS on the same computer with the drives plugged into the same ports, and the copies were all good! But much slower (approx 30MB/sec instead of 100MB/sec).
Since Windows doesn't check file copy accuracy, this would be a big problem even if it wasn't repeatable - but since it happens "all the time" and "over and over" with the same files, it's just plain crazy!
I have one other strange memory issue. I have two 4GB DRAM sticks in my computer, but Properties shows my memory as:
"8.00 GB installed (3.98 GB usable)" and right under that it says "64-bit operating system" - so why can't it use half my memory?