then you will need to increase the size of the CONTIG.ISO file or make the source ISO file contiguous (e.g. using WinContig or Defraggler).
Make a CONTIG.ISO file
1. Run "\_ISO\docs\E2B Utilities\Make_CONTIG.ISO\Make_CONTIG.ISO.cmd" from the E2B drive to quickly make a new CONTIG.ISO file
Copy a large file - e.g. 3.8GB, to the \_ISO folder of your E2B USB drive and rename it as CONTIG.ISO. Any file will work as long as it is larger than the largest ISO that you might use (up to 3.9GB). You can also create a large file using the RMPrepUSB - Create Ext2 FS button if you wish.
2. Then run WinContig on the E2B USB drive to make sure that the CONTIG.ISO file is contiguous (or use DeFraggler or WinContig just on the \_ISO\CONTIG.ISO file).
Recommended for Easy2Boot (fastest!) - SanDisk Extreme SDCZ880-128G-G46