I experienced identical symptoms with another hard drive almost two or three weeks ago. You have a failing hard drive. There are certain sectors on your hard drive that are damaged. Writing to those sectors causes the write delays. Since they aren't at the beginning of the disk, you can use your hard drive for some time before you start experiencing those symptoms. With my hard drive, my system ran fine for a couple of days. Then, the kernel panicked infrequently. The file system remained corrupted and irreparable. I gave up and tried to salvage my data. I suggest you do the same because the more you keep spinning that drive the more difficult it'll become to access data.
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