Usb hard drive wont mount

i have a drive i use on my old computer but my new mac book pro wont even recognize it. anyone have any fixes for this.

I hope that you can help me as well. I just spent 2 hours with Apple tech support to no avail (case # 83844913). I have a Thecus Y.E.S nano N1050 OTG/USB photo bank enclosure on a 40GB drive that I took out of my powerbook when I put in a bigger drive. It mounts fine on my powerbook and it mounts on my macbook pro when in Windows XP but nothing happens in mac mode on my MBP. I've tried providing it with external power, doing that battery removal reset thing, running disk utilities repair, checking for the drive while booting from the install CD. It's weird that it mounts in Bootcamp (which I've uninstalled now) and I previously formatted it in bootcamp as fat32. On my powerbook titanium (which I just wiped and re-installed the newest OS) it mounts fine so I formatted it as MS-dos and it still mounts fine there and backs-up photos fine from cameras but won't mount on my MBP. In the sys profiler it says USB 2.0 Storage Device, so it does show up there. I have apple care but they haven't been able to help!

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