How Ubuntu converts an. iso into an. img

Recently a virtual machine was started using QEMU to load the image, while qemu loaded the image format:. IMG, and generally from the mirror corresponding to the official website download is. iso format, you need to convert an. iso to. img.

ISO files are described as follows: ISO format, ISO is a disc image file, can not be used directly, you need to use some tools to decompress before use. ISO is generally made of CD-ROM files into a file, and some CD-ROM software settings can only be installed from the CD-ROM, then the direct decompression or can not be used, need to use virtual optical drive software (virtual CD-ROM software many, Daemon tools is a good virtual optical drive software)

The. img file is probably described below: IMG format, IMG is a file compression format (archive format). IMG This file format can be considered a hyper-collection in. iso format. Because. ISO can only compress the storage medium using both ISO9660 and UDF file systems, meaning. The ISO can only compress CDs or DVDs, so it develops. IMG, it is to. The ISO format is based on the addition of the ability to compress storage media using other file systems. IMG can be backwards compatible with. ISO, and if it is to compress CDs or DVDs, the contents of the. img and. ISO formats are compressed in the same way.

From the above introduction, it can be seen that. IMG is a hyper-collection of. ISO, and the two extracts are the same, so a. iso is converted to. img and can be renamed. IMG directly.

CP Ubuntu-14.04.3-server-amd64.iso UBUNTU-14.04.3-SERVER-AMD64.IMG

Thank you