Windows Explorer doesn´t recognize my 2 nd HD

Hi
I´ve just conected a 2nd HD (Samsung 80 GB). I´ve changed it from another
computer also as a 2nd primary HD and it was O.K. It´s formated NTFS and
working fine. Partition Magic did recognized it. Acronis True Image found it
and I was able to made a Clone from a Seagate 250 GB (only 10% full). The
bios Setup recognize it and after the Clone I could even boot from it
changing the boot sequence in BIOS. Windows Disk Manager show it either.
Then came the problem: Windows Explorer doesn´t show it and Second Copy also
ignores it. I want to configure Second Copy to make exact copies of
everything I do in disk 01, evry thing that change while I´m working at
every 2 hours.
At least I have a clone I can use but I want it exactly as the original.
Any hint?
TIA
Edgard Kniriem