boot - Persistent Live USB - Limitations - Ask Ubuntu


i have ubuntu usb can carry around me @ times in case need/want use ubuntu on computer reason. (i find useful lot of things. gparted , dd command find useful, example.)

i tried installing ubuntu usb stick directly, found despite being usb 3.0 drive wasn't fast enough run full os from. performance poor.

so, trying use persistent usb drive instead. however, unclear how persistence works , result limitations are.

how far persistence extend? presume save settings between boots @ least, save files? if install apt-get persist? seems when boot on macbook live usb lacks drivers required wifi, drivers persist if install them?

persistence saved in file or partition named casper-rw, persistent home file or partition named home-rw possible. persistent install save data, program installs, customized desktops, except drivers loaded before persistence file read during boot, (nvidia graphics).

in syslinux type install, (sdc, unetbootin, universal, rufus, etc), system resides in root of drive casper-rw file. filesystem partition fat32 maximum size persistence file 4gb.

prior 14.04 syslinux type installs use persistent casper-rw , home-rw partition. persistent partitions no longer work except grub2 type installs, (mkusb , original multibootusb).

mkusb easy use, safe, versatile , make persistent partition of whatever size want, use remaining disk space make ntfs partition visible both linux , windows.

limitations, don't want unplug persistent pendrive while data being written persistence, luckily mkusb comes persistence backup tools.


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