I can do this, but I need you to do some more up-front investigation first. See if you can use strace to determine how the player requests the write to the partition -- does it do a write("/dev/hdaX", ...), or does it use mmap(), or what.. ??
If strace doesn't work, you can try Hijack's trace_fs=1, but I don't think it currently catches random raw disk writes -- try it and see if there's any observable behaviour. If not, then add some additional instrumentation to the sys_write() routine in linux/fs/read_write.c
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