A "WRITE DELAY" is when Windows notices that it has more requests for data-transfer to the disk-drive that it can immediately handle. Compare it to 6 people simultaneously placing orders at the order-desk at a fast-food counter -- the clerk will have to "prioritize" the orders, i.e., if one order is for a muffin, and there are muffins ready to be sold, the person that ordered the muffin will get the fastest service, while the other orders will be processed "later".
So, Windows prioritizes those write-requests, knowing exactly where the read/write head on the disk-drive is currently located (like the needle/arm on a record-player), to minimize the head-movement, and thus maximize the "throughput" of the disk-drive.
But, if there is some problem completing one of the I/O requests, i.e., a "bad" spot on the disk-drive, then you could get a "write delay problem". The implication is that the disk-drive is starting to "die", and should be checked-out, and maybe should be replaced.
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