Monday, 10 June 2013

RMPrepUSB v2.1.707

I have added David B's great new utility Start_VM.exe to this version.

Start_VM.exe automagically dismounts the USB drive before running QEMU - this allows QEMU to have full write access to the USB drive. This means that any writes which are made to the USB drive under grub4dos or an OS booted to via grub4dos will actually work and the sectors on the USB drive will be permanently changed. For instance the default command will work in this mode as data will be written to the \default file or linux with persistence will work. This mode will now be the 'standard' mode for all future RMPrepUSB versions as it gives full rd/wr emulation capabilities and more reliable OS booting!

So v2.1.707 and later versions now have two different QEMU boot from USB drive options:

F11 - boot from USB drive but now with full read/write access (but the host Windows OS will not be able to access the drive whilst QEMU is running).

Ctrl+Shift+F11 - boot from USB drive in 'snapshot' mode. This used to be the default action in previous versions of RMPrepUSB (used to be F11). This mode is still useful if you want to be able to modify files on the USB drive whilst QEMU is running because the USB drive is not dismounted. This allows you to make simple changes (e.g. colour or menu position) and reload the menu whilst still running in the QEMU session and so this mode is still useful in some cases.