I set up my A600 gaming drive this way (motherboard IDE though not USB). I made an emulated A600 through WinUAE, set it up exactly how I wanted, then I attached a 2.5" HDD and installed it with HDToolbox/HDInstTools (under AmiSYS Os3.9). I then mounted my A600 emulation HDF and the 2.5" together for access through AmiSYS and I copied everything over this way for maximum speed.
Before you do the copy, make sure you have plenty of disk buffers, such as:
addbuffers dh0: 1000 (source)
addbuffers dh1: 1000 (destination)
Then from the shell, type:
copy dh0: dh1: all clone
This will copy all files from dh0: (source) to dh1: (destination) and will preserve the file dates as well as directory structure. Everything will be copied, including disk.info (icon). The added bonus of doing this copy is that it will be super fast on your destination drive as there will be no file fragmentation.
