guys I have brought a Tech com 3.5 HDD casing for my Internal harddisk .The problem is it does not get connect in my laptop 1545 vista in AHCI mode and when there is XP in ATA mode then it gets connected but there is a lot of make and break kind of connection.So guys what should I do is there a problem in casing or in my harddisk or is it AHCI problem Please help ..................