this page gives you all IBM/Hitachi Travelstar model click here
For value for money, get at least 40GB.
For performance 7200rpm is the best, 5400rpm is good, 4200rmp is slowest
There are others, find for you later.
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.