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I have a USB flash-drive with some bootable iso's on it and i need a way to make them smaller they must keep the iso file extension and they must be bootable just like they were before. Does any one know how i could do this. Thanks in advance.

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  • This might depend on the OS used? – Peter Sep 8 '14 at 8:50
  • @Peter Windows 7 64bit – 09stephenb Sep 8 '14 at 8:52
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MagicISO has its UIF format and PowerISO has a DAA format. Both image formats can be mounted without extracting, but are not be bootable.

Most ISO tools let you "compress" an ISO file, such as described here for MagicISO. I'm not sure what that does exactly, but you could try that.

Bottom line: bootable ISO images have very limited options in terms of compression.

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