Hi, I have a Dell E521 with Vista on it. I'm trying to change the actual hard drive (Seagate 160gig) to a bigger one, a WD 320 gig. Both are internal SATA HDD I clone the 160gig to the 320gig with Acronis True Image Home 10 by using the automatic cloning. Once the cloning is finished, I remove the 160gig drive and leave the 320gig drive. The system restart but it cannot reboot ! it just loop by showing the Dell startup logo and a black screen. And it keeps looping. EDIT: I cannot even see the Vista loading bar It seems that the 320gig drive do not have a bootable partition . But since I cloned it, it is supposed to be bit by bit identical to the 160gig drive, except the bigger size. Someone have an idea of the problem Thanks ps: I known I can make an image of the 160gig active partition and dump it on the 320 gig but I'm just wondering why cloning is not working.