IMG, in computing, refers to binary files with the
.img
filename extension that store raw disk images of floppy disks, hard drives, and optical discs or a bitmap image – .img
.To open a.img or.ima file or mount it as a virtual drive you can use a software called Magic Disc, you can learn about how you can mount img files in this tutorial on mounting ISO files as a virtual drive, though the tutorial talks about ISO files,.img and.ima files can also be mounted in a similar way. With it, you can open the X-ray or another medical image directly from the disc, via a ZIP file, or even by having it search through your folders to find the DICOM files. Once one is opened in MicroDicom, you can view its metadata, export it as a JPG, TIF, or another common image file type, and more.
Overview[edit]
The
.img
filename extension is used by disk image files, which contain raw dumps of a magnetic disk or of an optical disc. Since a raw image consists of a sector-by-sector binary copy of the source medium, the actual format of the file contents will depend on the file system of the disk from which the image was created (such as a version of FAT). Raw disk images of optical media (such as CDs and DVDs) contain a raw image of all the tracks in a disc (which can include audio, data and video tracks). In the case of CD-ROMs and DVDs, these images usually include not only the data from each sector, but the control headers and error correction fields for each sector as well. Since IMG files hold no additional data beyond the disk contents, these files can only be automatically handled by programs that can detect their file systems. For instance, a typical raw disk image of a floppy disk begins with a FAT boot sector, which can be used to identify its file system. Disc images of optical media are usually accompanied by a descriptor file which describes the layout of the disc, and includes information such as track limits which are not stored in the raw image file.
Filename extensions and variants[edit]
The
.img
file extension was originally used for floppy disk raw disk images only. A similar file extension, .ima
, is also used to refer to floppy disk image files by some programs. A variant of IMG, called IMZ, consists of a gzipped version of a raw floppy disk image. These files use the .imz
file extension, and are commonly found in compressed images of floppy disks created by WinImage.![Winimage Winimage](https://www.woodworkingnetwork.com/sites/woodworking/files/IMA_Schelling.jpg)
QEMU uses the
.img
file extension for raw images of hard drive disks, calling the format simply 'raw'.CloneCD stores optical disc images in
.img
files and generates additional CloneCD Control Files (with .ccd
extension) for each image to hold the necessary metadata. The CUE/BIN format stores disc images in .bin
files, which are functionally equivalent to .img
image files, and uses .cue
files as descriptor files.Size[edit]
The file size of a raw disk image is always a multiple of the sector size. For floppy disks and hard drives this size is typically 512 bytes (but other sizes such as 128 and 1024 exist). More precisely, the file size of a raw disk image of a magnetic disk corresponds to:
Ima Document
- Cylinders × Heads × (Sectors per track) × (Sector size)
E.g. for 80 cylinders (tracks) and 2 heads (sides) with 18 sectors per track:
- 80 × 2 × 18 × 512 = 1,474,560 bytes or 1440 KB
For optical discs such as CDs and DVDs, the raw sector size is usually 2,352, making the size of a raw disc image a multiple of this value.
Comparison to ISO images[edit]
ISO images are another type of optical disc image files, which commonly use the
.iso
file extension, but sometimes use the .img
file extension as well. They are similar to the raw optical disc images, but contain only one track with computer data obtained from an optical disc. They cannot contain multiple tracks, nor audio or video tracks. They also do not contain the control headers and error correction fields of CD-ROM or DVD sectors that raw disc images usually store. Their internal format follows the structure of an optical disc file system, commonly ISO 9660 (for CDs) or UDF (for DVDs). The CUE/BIN and CCD/IMG formats, which usually contain raw disc images, can also store ISO images instead. Ssh tunnel 15.03.IMG as an Image file format[edit]
Also,
.img
is a planar bitmap graphics file using simple run-length encoding, originating with Digital Research's GEM. It was commonly used on the Atari ST line of home computers, but also with some GEM-based PC software such as Corel Ventura or Timeworks Publisher.Other disk image files[edit]
In addition,
.img
is an Apple Disk Image used by the Mac OS X or macOS operating system.Garmin .img is a hard-disk image file format which contains a header and many subfiles and used to store the maps for its GPS units.
Tools[edit]
The raw IMG file format is used by several tools:
- RaWrite and WinImage use the IMG disk image format to read and write floppy disk images.
- ImDisk and Virtual Floppy Drive can mount a raw image of a floppy disk to emulate a floppy drive under Microsoft Windows.
- Nero Burning ROM supports reading IMG files for creating bootable CDs.
- mtools allows manipulation of MS-DOS floppy disk images in Unix systems.
- Programs such as dsktrans from the LibDsk[1] suite of command-line tools (available for Linux, MS-DOS, and Microsoft Windows) will convert between different raw disk image formats.
- dd can be used in Unix to create raw disk image files of disks.
- QEMU uses IMG files as its default format for hard drive disk images.
- IrfanView with the plugin 'FORMATS' (formats.dll) supports viewing GEM vector graphics IMG.
- Garmin MapSource or GPSMapEdit can be used to read Garmin hard-disk image
.img
format.
References[edit]
- ^LibDsk suite of tools for accessing discs and disc image files
Retrieved from 'https://en.wikipedia.org/w/index.php?title=IMG_(file_format)&oldid=975571768'
A utility to mount hard disk and optical disc images in DOSBox.
Note: You can use Disk Explorer to copy files and folders to/from images (but not to delete them or DOSBox will consider the images corrupted! Read the aforementioned link for more info).
![Open ima files online Open ima files online](https://arxiver.files.wordpress.com/2016/11/streicheretal-1611-07203_f2.jpg?w=460&h=280)
- 2Optical disc images
- 2.1Loading an ISO image
- 2.2Loading a CUE image
- 3Hard disk images
- 3.2Loading a regular hard disk image
- 3.3Bootable hard disk images
Command line parameters
IMGMOUNT DRIVE [imagefile] -t [image_type] -fs [image_format]
-size [sectorsbytesize, sectorsperhead, heads, cylinders -u DRIVE]
- DRIVE
- Drive name (letter) the image will use
Open Ima Files Download
- a for the drive letter a: or
- b for the drive letter b: etc.
- imagefile
- Location of the image files to mount in DOSBox. The location can be on a mounted drive inside DOSBox, or on your real disk. It is possible to mount multiple (e.g.
'~/images/CD1.cue ~/images/CD2.cue [.] ~images/CDn.cue'
) optical disc images (ISOs or CUE/BIN) as well, if you need CD swapping capabilities specify all images in succession. The CDs can be swapped with CTRL-F4 at any time.
- -t
- The following are valid image types:
- floppy
- Specifies a floppy image or images. DOSBox will automatically identify the disk geometry (360K, 1.2MB, 720K, 1.44MB, etc).
- iso
- Specifies an optical disc iso image. The geometry is automatic and set for this size. This can be an iso or a cue/bin.
- hdd
- Specifies a hard disk image. The proper CHS geometry must be set for this to work.
- -fs
- The following are valid file system formats:
- iso
- Specifies the ISO 9660 optical disc format.
- fat
- Specifies that the image uses the FAT file system. DOSBox will attempt to mount this image as a drive in DOSBox and make the files available from inside DOSBox.
- none
- DOSBox will make no attempt to read the file system on the disk. This is useful if you need to format it or if you want to boot the disk using the BOOT command. When using the 'none' filesystem, you must specify the drive number (2 or 3, where 2=master, 3=slave) rather than a drive letter. For example, to mount a 70MB image as the slave drive device, you would type:
'imgmount 3 d:test.img -size 512,63,16,142 -fs none'
(without the quotes). Compare this with a mount to read the drive in DOSBox, which would read as:'imgmount e: d:test.img -size 512,63,16,142'
.
- -size
- The Cylinders, Heads and Sectors specification of the drive. Only required to to create bootable hard disk images. This means it is not required for either loading a regular hard disk image or optical disc images.
- -u
- unmount an image.
- e.g. if an disk image was mounted to be the disk drive a: type:
'imgmount -u a'
Optical disc images
Loading an ISO image
An example in Windows
Other example in Windows (more than one image)
An example in Unix
Loading more than one image
It is possible to mount more than one image, and then switch between them using ctrl-f4Example in Linux:
Loading a CUE image
An example in Windows
Ima File Download
An example in Unix
Czi Matlab
Note: make sure to use CUE and not BIN for Mixed Mode CDs
You can mount bin/cue type CD images with the IMGMOUNT command, and it will 'sort of' work if you specify the .bin file as the file to mount. However, it will not mount the audio tracks of the CD correctly if you do this. Specifying the associated .cue file will load all tracks correctly.
Note: you can mount CUE with an ISO for Mixed Mode CDs
It is also possible to use a cuescheet in combination with an ISO and compressed audio tracks in OGG or MP3 format.
Hard disk images
The '-size' parameter (required to to create bootable hard disk images)
Corechip semiconductor usb to ethernet driver. Didn't understand the '512,63,16,142' part?
All you really need to know is that the formula is always:
X is the number of 'cylinders' in the image. It's based on the image's size. If you create the image through Bochs, then it would tell you the number of cylinders.
If you want to understand a little more, here's a more detailed explanation than the official one on the numbers.
Open Ima Files 2016
Now, let's say you created a 70M image using the bximage program from Bochs. You will then get the following details:
You don't actually need to know the total numbers of sectors, other than to calculate the sector size (in bytes):
Now you have all you need.
Start the line with 512 and then add the 3 first parts in reverse order. In other words:
imgmount .. The coat by athol fugard. -size 512,63,16,142
- Here's a tip: the first 3 numbers should always be the same. So all you really need is the cyl=X. In other words, it should always be:
imgmount .. -size 512,63,16,X
- Only the X changes, according to the size you specify when you create the image.
That wasn't so hard, was it? ;-)
Loading a regular hard disk image
Example
Bootable hard disk images
Format the partition with 'format'
Start DOSBox again and type:
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Exit DOSBox.
The hard disk image is now bootable! See Loading a bootable hard disk image.
Loading a bootable hard disk image
Open Ima Files
From now on, whenever you want to boot from drive C:, start DOSBox and type, for example:
Retrieved from 'https://www.dosbox.com/wiki/index.php?title=IMGMOUNT&oldid=4119'