shragae wrote:
Ah -- mystery solved. For some reason they've segmented the disk into 2 virtual drives -- one is nearly 600 GB. I wish they hadn't done that, but don't feel like reformatting the entire laptop. . .
shragae, it's the same on the boot drive and 2nd bay drive, if it comes with one.
Be careful to not delete any partitions until you have created an Asus Backtracker USB 3.0 16GB flash recovery drive to preserve for later. Be sure and test a restore against an empty drive - keep your original Asus Windows HDD boot drive out of the laptop when trying the restore.
Asus Backtracker may erase any other USB drives connected when creating the recovery flash drive, so unmount them first.
When doing a restore Asus Backtracker will first re-partition the drives in both bays, effectively erasing them, before it begins the restore - if the flash drive isn't compatible it will fail to restore and you will have blown away both drives - be careful and pull out the original HDD before doing the restore - you only need the new boot drive in the laptop to do the restore.
Here is what the drive partitioning looks like on my G750JH after going through all of this to combine the volumes:

Note, I replaced the 1TB with a Samsung 840 Pro 512GB, and put the 1TB HDD in an external USB 3.0 enclosure.
Have fun
🙂Once you are sure that the Asus Backtracker USB 3.0 16GB flash drive works for restore, then you can go about deleting the partitions on the boot drive to combine the space into a single C partition on the Bay 1 drive, and a single D or E partition for the Bay 2 drive.