Thursday, 23 June 2016

RMPrepUSB v2.1.731 and grub4dos 0.4.6a

RMPrepUSB v2.1.731 will install grub4dos 0.4.6a when you use the 'Install grub4dos' button.

Under some circumstances, you may hit the grub4dos 0.4.6a bug where it does not like a certain partition on one of the drives in your system and fails to boot to grub4dos. This is the same issue as you may sometimes get when you boot to E2B and get a E2B.cfg file missing error.

The solution is to use an older 0.4.5c version of grub4dos.

In the case of RMPrepUSB, simply copy the required 0.4.5c version of grldr to the RMPrepUSB folder (press F3 in RMPrepUSB and it will open the correct folder). For E2B, replace the \grldr file.

I suggest you use the 2015-05-18 version of grldr 0.4.5c (I have not validated later versions of 0.4.5c, so they may have bugs).

Note that 0.4.5c has some missing features.

Version 0.4.6a has:
  • A fast USB 2.0 rd/wr driver
  • .jpg image file support for backgrounds
  • ext3/4 support
  • Better ISO, Joliet and UDF support
  • Can boot from non-contiguous files (if not too fragmented) using map command
  • Large font support
  • Stamp and Animated graphics support
  • Many bug fixes, incl. NTFS file write bug fix
  • Better debugging
  • Extra commands
The bug in 0.4.6a is difficult to reproduce, but we won't find it by using 0.4.5c all the time. If you find a system which shows the problem, please try to narrow down which partition it is that is causing the problem (e.g. change the partition type to 0 - then see if you can boot to grub4dos - repeat for each partition until you find which one is causing the issue, then make an image of the bad partition and send me or the developers the image + the MBR .bin file so that we can reproduce the problem). The bug is reported here.