Using Paragon GPT I can't use a second 3TB HDD

Hi,

A few months ago I bought for my XP desktop a 3TB HDD and Paragon GPT Loader. The installation was successful and I was able to use the whole HDD capacity. After a while a bought a second 3TB HDD. I install it but I can't use the entire space of the second 3TB HDD. All I can use is a 746GB partition.
Opening GPT Disk Manager both 3TB HDD are labeled "Basic GPT Hard Disk", but if a try to create a partition on the second 3TB HDD the maximum partition size is 746GB.
How can I set GPT Loader to "see" the whole capacity of the second HDD?

 

Please clarify is the drive ext or internal on the second drive?

 

The drive is internal. Both hard drives are internal.

 

Is this software capable of supporting 2 3TB internal drives? I have an old xp box with 2 SATA controllers that I'm interested in using as my music server, and I'd like to put 2 internal 3TB drives in using one of them for backup.

 

Nobody from support service from Paragon cannot answer to the indicated issue?