whats the difference mean?

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Joined
22 Jul 2004
Posts
1,237
Location
North East, Cleveland
Hey im looking for either one of these harddrives but dont understand whats the difference.

Seagate Barracuda 7200.10 320GB U100 - £61.48 inc vat

Seagate Barracuda 7200.10 320GB S300 - £60.82 inc vat

Cheers
 
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