You probably have grub boot code in sector 30.
You just need to erase that sector.
One way is to use RMPrepUSB - Drive->File - x.mbr - 0 - 1sec - 0 to save a 512byte MBR
Then write it to LBA30 using
RMPrepUSB - File->Drive - x.mbr - 0 - 30 - 0 to write it to sector 30.
Then switching .imgPTN files should work.
Topic: Easy2Boot
Date 24/11/2015
By SteveSi
Subject Re: imgPTN on USB HDD
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