External hard drives not showing up in Server 2008 SBS.

I have a server 2008 SBS I have been using 2 1TB external hard drives  and I use Windows server back to do Full backups. I use two externals becuase I take one home with me every night and leave the other one to perform the backup.
everthing was working great but a week ago the server stop seeing the  drives. if I reboot it sees the one that its connect but if I remove the external and swap it stops seeing it. I dont see them in device manager or disk management. I have unistalled the USB hubs from device manager and scan for hardware changes with no sucess. since I only have one server and its works as exchange, file server, with 3 virtual servers I really cant reboot everyday.

any ideas?
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Nenad RajsicCommented:
try using a different USB port on your server and also check your USB cables  (replace them to test it). See if that helps.

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LENEROAuthor Commented:
I have tried all of the ports with the same results but I will try the cable
LENEROAuthor Commented:
the new cable worked

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