Data sheet seems to indicate the 153 only has 16MB cache, 154 has 32. I am guessing that's the difference, and the website is just wrong as it seems to indicate even the 153 has 32mb.
I'm also wondering if one is 3 x 500 GB platters and the other is the older 4 x 38X GB platter configuration. But it's kinda hard to say. the HD154UI if for sure 3x500 GB but I dunno what the HD153UI is. Hmm.. Oh well. I already bought 4 of the HD154UI ones earlier today while at the shop in Honda City. So now it's just academic wonderment I guess.
I'm also wondering if one is 3 x 500 GB platters and the other is the older 4 x 38X GB platter configuration. But it's kinda hard to say. the HD154UI if for sure 3x500 GB but I dunno what the HD153UI is. Hmm.. Oh well. I already bought 4 of the HD154UI ones earlier today while at the shop in Honda City. So now it's just academic wonderment I guess.