Table of Contents

Partition Image files

.imgPTN or .imgPTN23 files can be used as partition images (and in some cases, files with no file extension).
Partition image files which have the exact same filename but no file extension will replace partition 3 (e.g. files Ubuntux64.imgptn + Ubuntux64 will replace Ptn1 and Ptn3).
A Partition Image is a sector-for-sector image of a partition (volume).
It is possible to instantly replace Partition 1 and\or Partition 3 on the E2B USB drive with the contents of partition image files.
When a .imgPTN file is ‘switched-in’, one or more of the existing partitions on the E2B USB drive are replaced/removed and a backup is made of the original MBR.
After an image is ‘switched-in’, you must Restore the original E2B Partitions MBR) before another can be selected.
You can also use \_ISO\SWITCH_E2B.exe to switch-in or Restore the original drive partitions (MBR).
You could have many different UEFI-bootable FAT32 .imgPTN23 image files each with a Secure Boot payload, or .hfs images or ext4 or swap partitions, etc.

Example 1 – .imgPTN file

Normal Easy2Boot USB drive showing position of a .imgPTN file (blue block) within the first primary partition.

After ‘switching-in’ the .imgPTN file, the USB drive contains a different partition and partition 2 is removed if it is not the small type 21 hidden partition. Partition 3 (if present) is removed.

Example 2 – .imgPTN23 file

Typical E2B v2 two partition E2B 16GB USB drive

E2B USB drive after ‘switching-in’ the PassMark Memtest86 (MBR+UEFI).imgPTN23 file (Partition 2 and 3 if present are not deleted)

Example 3 – .imgPTN23 file + 2nd image file

Here we have a .imgPTN23 file but also second image file on Partition 3 of the E2B USB drive. We can use the E2B menu, or the agFM menu or SWITCH_E2B.exe to switch in the images.

The E2B USB drive has three partitions as below (the third partition can be NTFS or FAT32.

After switching in both image files, the first partition now contains the contents of the .imgPTN23 file and the third partition contains the contents of the file with no extension. Because the Start sectors are in ascending order, the disk will be seen as ‘valid’ by UEFI BIOSes. We can UEFI boot to Partition 2 (agFM menu) or to the contents on Partition 3 (in this case it contains a secure-boot signed UEFI+NTFS driver which will the secure-boot from Partition 1).

Example 4 – .imgPTNREP3 file

.imgPTNREP3 files must be on Partition 3 of the E2B USB drive.

E2B drive with 3 partitions (normal state)

E2B drive with .imgPTNREP3 hfs image file switched in (6.68GB).

Files on a bootable USB drive partition, ISO files, .zip files, image files or the contents of a folder can be converted to a .imgPTN, .imgPTNREP3 or .imgPTN23 file using the Easy2Boot ‘MPI ToolKit‘. You can also make an image of any partition using RMPrepUSB.exe – Drive->File.

How to ‘switch-in’ a Partition Image file

You can switch-in a partition image or restore the E2B USB drive partitions using any of these methods:

E2B Menu system.
agFM menu system (Legacy or UEFI).
SWITCH_E2B.exe 32-bit Windows application…

Partition Image listed in the E2B Menu system (afterwards you must Legacy boot to restore the original E2B partition 1).

Note: To pick .imgptnREP3 files from partition 3 in the E2B Menu system you will need to copy the “\_ISO\docs\Sample mnu files\E2B Menus\PTN3_IMGPTNREP3_MENU.mnu” to the \_ISO\MAINMENU folder. Edit the .mnu file as required. This also adds a ‘Restore E2B Partitions’ menu.

Partition image file listed in agFM Menu system.

UEFI-boot to agFM in Partition 2 to run the new partition or restore the E2B partitions.