My pc and mac computer do not recorgnise my fantom drives

Connect it to a PC, and use "Disk Management" on the PC to delete all the partitions:
Click Start
Right-click My Computer
Click Manage
Expand "Storage"
Click "Disk Management (local)"
Click to select the partition.
Right-click and choose Delete.

I would check the usb connection. Try your drive in a different usb on your mac, see if that works.

Try connecting it to several computers (Mac, PC) to see if there is a "hardware" problem with the device.
If there is, and the warranty still is valid, exercise the warranty to get a replacement.

go to my computer p[roperty then hardware -> device amnager then uninstall usb drivers from it then install aagain.
then connect your harddisk then it found.

Make sure you have installed the software drivers first before connecting the USB hard drive. USB is Plug and Play, and when you connect hardware that requires drivers to be installed first, it will not function correctly or not work at all sometimes..

Is your drive getting detected in your computer ?

If no then go to control panel and add hardware to get it detected .

My problem and my solution
-Fantom Drives 200GB was working correct on desktop which runs Windows XP
-Connected it to a laptop which runs Vista and the drive became undecteable by both platforms. It showed up on Vista's device manager for a hot second and then vanished all together.
-Changed the USB cable and still no go
-Finally, I made the decision to void the warranty by opening it and connecting it directly to my CPU and there it all was. 170GB worth of data. Same as what scott201201 is suggesting above.
-Moral of this story...."Backup your "backup".

Advise. Please make sure to read the warranty on your product you may be able to send it back to the company if it is under waranty. I read on another blog that the miniboard in the case where the usb connects to the device was faulty and needed repair. I know this is the same with mine because it works perfection when connected directly to the desktop.

Good luck techies

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unless you fancy trying to connect the drive inside the unit directly to a pc by taking the box a part.

You can remove the drive from the casing and connect it inside your pc, using IDE cables if its an IDE or a SATA cable, if it comes with one

As this question is a little vague...Here is a link to the Fantom website (Mac Issues): http://www.fantomdrives.com/support/faqs/hdfaqmac.php4