Your HDD really is an eight year old 465GB Seagate ST9500325AS which runs at a pokey 5400RPM. It's also inefficiently partitioned:
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sdb1 only uses 18MB, and giving it 200MB is overkill. Next time, I'd give sdb1 only about 50MB.
sdb2 uses 246MB and has 754 MB free.
sdb3 is partitioned with lvm. I suggest you run vgdisplay to see how its space is used.
And, since an eight year old consumer HDD is a failure waiting to happen, I would suggest you replace it; a much faster and very well respected SSD is only $78 at Amazon. You will also get longer battery life as well as faster Linux response time.
