After happily receiving my second Western Digital Special Edition 8 MB Cache (WD1200JB) hard drive and mailing the the rebate forms I compared its sector count to my original drive. The sector count is significant for these drives because it indicates if the drive is based on 40 GB platters, or the newer 60 GB platters. I had read that the 60 GB/platter drive was preferable because the higher density platters of the drive gave it better performance. But how much better? And if I received the 40 GB/platter drive, should I be disappointed and return it?