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ISO files (images from CD/DVD) use a different file system (f.e. ISO9660, UDF) than image files for flash drives (f.e. FAT, FAT32)and usually can’t be used for flash drives. You can write them on a flash drive, but it won’t have the results, you probably expect. USB Image Tool doesn’t do any file system conversion, so most likely you won’t see the content of the ISO, when you write it on a flash drive.
There exist special ISO files with a hybrid bootloader (usually Linux LiveCDs), that can be used on a flash drive and a CD/DVD, but unless stated otherwise, ISO files won’t work on a flash drive.
@tom: That is the explanation. Gzip stores the original file size in a 32 bit field. This field can only hild upto 4GByte (which at the time of gzip creation was utopical). Because of that, the percentage calculation becomes wrong.
When backing up an 8GB flash drive and using gzip format, although the backup restores correctly, UsbImage does not realise that it has reached the end of the restore operation, and goes on processing way beyond 100%. I suspect this might go on indefinitely. I killed it off at 140%. This does not happen with zip format or uncompressed images.
When a zip-compressed image is created, the .ima file inside the .imz is dated one month later than it should be. This is also true of the .ima file if subsequently unzipped.
@Rackbrane: Gzip file format has only a 32bit integer to store the original files size. For larger files the size isn’t correct. For that reason USB Image Tool can’t show the correct progress percentage. The issue with the incorrect month is under investigation. Thanks for giving feedback.
I try to create a bootable Linux USB from an image which is proven to work. After restore I get the Error message “Could not write to the USB device (Code: 0)! Please close all open explorer windows for this device”
However, no explorer Window is opened…. using Win7 .