I want to buy a new harddrive for my PS3, and im looking for either 160 GB or 250 GB, but am I right in understanding that if I get a larger HDD it will need better specifications. I know that the stock HDD in the PS3 has a rotation speed of 5400 rpm, so will i need a higher spin speed or will the same spin speed deliver the same performance on an even larger HDD. Also, can anyone give me any info on the cache, because I don't really understand what that means. Any help is greatly appreciated. Thanks.