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Converting .DMG or .CDR to .ISO on Mac OS X

To convert .DMG to . iso

hdiutil convert /Users/alpa/Desktop/winxp-sp2.DMG -format UDTO -o /Users/alpa/Desktop/winxp-sp2.iso

To convert .cdr to .iso

hdiutil makehybrid -iso -joliet -o /Users/alpa/Desktop/winxp-sp2.iso /Users/alpa/Desktop/winxp-sp2.cdr

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