I'm trying to migrate my OS partition (F:\) to my new SSD drive (L:\) but am getting this error message after I select which hard drive I want the OS moved to. No free space (can't create partition of requested size) (error code: 0x10003) The OS (Windows 7 64 bit) partition is 195 GB but only about 90 GB of it is being used. The SSD drive is a 160GB drive with 148 Gigs free (nothing is on it, that's just all that is available). The Hard drive the OS is on is a 1 TB hard drive with 2 other partitions on it (one of the other partitions has Windows Vista on it, however I rarely use Vista anymore, though that partition has a lot of programs on it that I do use). One thing I did try was selecting a 1TB external hard drive as the target hard drive (which at the moment has very little on it) and that didn't come up with an error message, it said it would take up about 16% of the hard drive, and the copy button was no longer grayed out like it was before. I've heard people mentioning hidden partitions that can cause issues like this, so part of me thinks it may have something to do with the windows vista partition (which was installed before Windows 7). Though the fact that my external hard drive has no errors come up but my SSD does makes me wonder if maybe there is a setting on the SSD I need to change. Any thoughts as to how I can fix this? Thanks for your help!