The only way to repair the iso image is to entirely re-write it. So there is no way to repair a damaged iso9660 images, and therefore no fsck for this particular file system. Also these file systems are "static" You build then once and can not modify them except for a certain special type of concatenation. CD/DVDs are typically read-only so they cannot be readily repaired. "fsck" is a file system test/repair tool and iso9660 is a file system (for DVDs and CDs, so it makes sense when you type the command fsck /dev/sr1, but there is no fsck for the iso9660. It seems to map to an iso9660 file system image of some partition on your USB device. This device would normally be used for a DVD/CD which is often read-only. dev/sr1 is an cd/dvd DEVICE, not a partition. You must do the partition table accesses on that device not /dev/sr1. The U3 system mounts on dev/sr1 while the rest oi the 8 GB USB drive is usually /dev/sdb or sometimes /dev/sdc. You are using terms in a confusing way, and confusing yourself along the way.
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