|Watch the POST screens at start up to see if ALL of your drives are properly identified by both the model and the FULL capacity. |
The the SATA drive shows only 127/137GB then your BIOS is NOT 48 bit LBA compatible.
If that is the case then DO NOT use the drive without taking some corrective action.
There might be a BIOS update to allow 48 bit LBA compliance. If not then you need an add in controller card that you then connect the 250GB drive to. That will allow the use of all the drive capacity.
Using the drive if your system is not 48 bit compliant will eventually result in data loss or corruption on that drive. Look at the link below for more information on this topic.