因為排線上的洞而被罵的廠商還真是無辜啊...
那個洞是用來偵測ATA-66用的
Seagate的Ultra ATA/66 FAQ網頁有寫
http://www.seagate.com/support/kb/disc/ultra_ata_66.html
就在問題 What is required to run in Ultra ATA/66 Mode? 解答的最後一句
The cable must have a notch cut in line 34 to correctly detect an Ultra ATA/66 device.