I have two Maxtors and have just started running HDD Health (free).
My HD1 failed recently (a 6L250SO) and was replaced with a 6Y250MO. Both original drives were 9 months old when the failure occured. Now the remaining 6L250SO is starting to make noises a bit like yours and HDD Health is showing various read/write, seek rate, spin up time and other errors, but the overall program says there are no known problems with the drive.
Based on experience of the failed drive I am suspicious of both the noises you have and those currently being experienced by me. Hopefully I`m wrong but I am prepared for the drive to fail.
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