Linux 17.1 on usb - query re: casper-rw etc.
Thank you for your responses and I appreciate the information. It's evident I have more to learn. My new computer has a single 512GB SSD on which windows 7 is installed, and 2 WD red 3TB HDD's in a Raid 1 configuration with A single GPT partition, intended for more secure user data storage. When I boot from the Linux USB, the only devices that appear on the file manager are the SSD and casper-rw; the 3TB is not there. Any attempt to open or explore this device results in the error message 'unable to mount casper-rw' followed by 'Device /dev/loop1 is already mounted at '/media/mint/casper-rw'. The 32GB USB drive that Linux Mint boots from does not show up in this device table. It does show up in the windows file manager as does the SSD and the 3TB WD as a single drive. The USB drive indicates 5GB used out of 32, with 27GB free, however this additional space does not appear to be available for storage within Linux.
So that I could become familiar with and continue to develop my use of and experience with Linux, my intent was (is) to create a new partition on the SSD for the Linux OS and two more on the WD HDD's; one for swap and the 2nd for user data. Following on-line recommendations I decided to start with the bootable USB which has spawned the above questions. However, pursuing partitioning to achieve my aim I decided to use GParted with the above hardware configuration. On attempting to run GParted within Mint 17.1 I get an immediate error message indicating "Libparted Bug Found! Invalid argument during seek for read on /dev/mapper/isw_chcbjhhgh_Volume1" followed by "Libparted Bug Found! The backup GPT table is corrupt, but the primary appears OK, so that will be used." Additional warning messages arise, however if I select Ignore, I end up with a choice of fixing the errors, and am able to see the following devices:
/dev/mapper/isw_chcbjhhgh_Volume1 (746.52 GiB) unallocated
/dev/sda (476.94 GiB)
/dev/sdb (2.73 TiB)
/dev/sdc (2.73 TiB)
/dev/sdd (29.22 GiB)
This is now bit overwhelming. I presume Linux sees the 2 WD 3TB drives as independent vs their windows Raid configuration, and the SSD and USB drives much as the windows file manager reports. I somehow think the 746.52 unallocated is an OS interpretation of what would be left if the 3TB only looked as a 2TB ntfs partition, but I know I am grasping at straws. I don't want to have GParted attempt to fix my Raid pair as they are not seen as a single drive. At this point I am at a loss as to how best make use of the Raid pair for use for data and swap file purposes in Linux.
Again, any feedback will be much appreciated.