I'm trying to add a file to an ISO then reburn it. In Disk Utility, I mount the original ISO, choose "Create From …" to create a new image file with "read/write" access and save it. When I mount the new image file, it's read-only and I can't change it or add files.
What am I doing wrong? Why can't I mount the image with write permissions?
Best Answer
Let's assume you have a physical or virtual FAT32 or ExFAT formatted drive. You could mount the ISO file and then copy all the files to this drive. I would recommend using the Terminal application to do the copy. Using the Finder application may result in the creation of
._*
files. Although these files can be removed by usingdot_clean
.To create a legacy bootable ISO file, use the command given below.
In this example, the name of the drive shown in the finder was
ESD-USB
. The-boot-load-size
was set to 8 sectors, because the size of theetfsboot.com
file was 4096 bytes and the sector size is 512 bytes.( 8 * 512 = 4096 )