
The primary cache is set to 1GB as above.There is 10 second delay write as shown.
Just after copying 1GB of photos, the computer froze. I didn't know at first how much I moved. After PC restart I saw 3GB of data moved, but only 1GB of photos were valid. The other 2GB were files with data as 00 hex. However the 2GB of photo were gone from the SD card!
Basically I lost 2GB of photo data :/
Since it malfunctioned at almost exactly 1GB (0.99GB) and no other programs were acting suspicious, I suspected it was fancy cache. I don't know whether this is casued by defer write or not.
When computer froze, no I/O were possible. I barely manged to run task manager but saw nothing suspicious, then everything froze so that even re-running task manager was impossible. Explorer started to crash and computer won't respond to anything. I had to hard reset the PC.