Suddenly the write speeds are extremely low. The drive was fine (I thought) since some time in 2009 and then I reformatted and began to copy 922GB of data to it. After about halfway through I noticed that it had slowed to a crawl. It is awfully slow to write on multiple controllers and in multiple machines even after reformatting again. I guess it is time for the scrap heap, but 1.5TB drives are relatively young to dispose of already.