The higher the density, the more data you can fit on a disc (Obviously). But, the more data you can fit in a sector, the faster it can read it. Example: Code: 0 1 0 0 1 0 1 1 1 0 1 0 1 1 1 That would be whats in a sector of a lowish density platter. Code: 01010101001010101010110010101010101001011 And this is what would be in a sector of a higher density platter. It takes the same ammount of time to read each high density sector, and low density sector, but you get 3x as much data out of the high density sector than you do out of the low density sector. Which means the drive with the higher density platters would be 3x faster than the drive with the lower density platters. At least thats how I assume it works
