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Old 03-27-2015, 09:09 PM   #1
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usb boot disk created for linux mint 17.1?

Good evening;
Following instructions on-line I attempted to create a bootable USB drive (32GB Sandsik extreme) with Linux 17.1 installed to enable a trial before attempting a permanent install beside windows 7 on a new computer with Win7 prof. installed.

On the usb I see a 4.0 GB area highlighted in G Parted but not accessible from the Linux file manager. This shows up as a ~1.4 GB sub-directory titled casper. and also as 4.0 GB 'file' named casper-rw. Can anyone explain what is the purpose of this sub-directory? The software I used to create the usb bootable drive and install Linux to is 'Universal-USB-Installer-'. This is a windows executable. My intent was to create a bootable usb drive for Linux that also contained my required hardware drivers, etc. This doesn't appear to be working 100%; although Linux 17.1 boots the nvidia hardware drivers do not appear to be available even though I downloaded these and they are on the same usb. On boot-up a message box indicates that hardware acceleration is not enabled and higher than normal processor usage may occur.

Any assistance / direction, etc. would be greatly appreciated.

Old 03-27-2015, 09:27 PM   #2
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The casper directory contains the compressed filesystem of the Live CD for Ubuntu/Mint and the casper-rw is the persistence file which can also be a partition if named as such and created as a partition. When you boot the Mint flash drive, you should not see the casper directory but should be able to see and use the casper-rw persistence file. I've never used the universal usb installer so can't comment on it.
Old 03-27-2015, 10:31 PM   #3
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There are a few ways to get linux on a usb drive.

One is to use apps like one may find at Many window and linux ways shown.

Another is to use a program to write the .iso file directly to a usb.

My favorite way is to install to the usb just as if it were a real internal hard drive. Use a cd/dvd and install to usb. Now I have to warn you this method has risks. I'd remove the internal drive.

Or I usually use a virtual machine booted to iso then attach usb.
Old 03-28-2015, 02:29 AM   #4
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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.



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