HDD capacity no recognized

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Mar 27, 2015
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Trying to clone my 1Tb primary HDD to a new 3Tb HDD
Win 10, disk management sees the new drive but only recognizes 764Gb of room. Attempting to follow advice from another thread found here, I tried to format as Simple but disk management won't allow me to increase the size. Using Macrium reflect v6 free software, it refuses to clone as the primary disk has 780+Gb of data.
Any suggestion or advice here would be most appreciated.
Thanks!!
 

20725

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Mar 27, 2015
61
0
4,630
Probably is MBR, It was the only drive in the tower when purchased. The computer is a Dell Optiplex 3040, running Win 10 64bit, I'll try and find specs on the MB