VDI is a disk image format used by VirtualBox that can also be mounted and
used with diskimage.device. The main advantage of VDI over raw image formats
like HDF f.e. is that it supports sparse or dynamic disk images where only
blocks that actually contain data are stored inside the VDI file.

Installation:

Copy vditool SYS:C/

Usage:

vditool <command> <.vdi file> [options]
Commands:
  create          Create a new .vdi file
  info            List information about .vdi file
  compact         Compact a dynamic .vdi file
  convertfromraw  Convert raw (.hdf) to .vdi file
  converttoraw    Convert .vdi to raw (.hdf) file
Command syntax:
  vditool create <.vdi file> [fixed|dynamic] <size>
  vditool info <.vdi file>
  vditool compact <.vdi file>
  vditool convertfromraw <.vdi file> <raw file> [fixed|dynamic]
  vditool converttoraw <.vdi file> <raw file>

The create command creates an empty fixed or dynamic VDI file of the size
specified (in GiB).

To create a 30 GiB dynamic VDI file:
vditool create empty.vdi dynamic 30

The info command lists information about the VDI file like the type (fixed/
dynamic), sector size, disk size, block size, number of blocks and number of
blocks currently in use.

To list info about harddisk.vdi:
vditool info harddisk.vdi

The compact command removes any blocks in a VDI file that contains only zero
bytes and then resizes the file. This operation is done in place and is not
well tested at the moment so it is recommended to do a backup of the VDI file
first before attempting this.

To compact the VDI file system.vdi:
vditool compact system.vdi

In order for compacting to be of any real use you will also need a program
that writes zero to any sectors unused by the filesystem(s) (AFAIK no such
tool exists for AmigaOS yet).

To convert amigaos3.hdf to amigaos3.vdi:
vditool convertfromraw amigaos3.vdi amigaos3.hdf

Convert back to raw (.hdf) format:
vditool converttoraw amigaos3.vdi amigaos3.hdf

Changes:

1.2 (25-May-2011)
 - Improved progress displays for compacting
 - Added break signal checks for compacting
 - Added convertfromraw and converttoraw commands

1.1 (22-May-2011)
 - First released version

 PERMSSN    UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[unknown]                   64      66  97.0% -lh5- 4973 May 25 16:36 AutoInstall
[unknown]                  700    1370  51.1% -lh5- 2496 May 22 15:55 license.txt
[unknown]                 2180    8120  26.8% -lh5- ae4c May 22 15:56 src/endian.h
[unknown]                 4362   18945  23.0% -lh5- f3e8 May 25 16:29 src/main.c
[unknown]                  271     476  56.9% -lh5- cc00 May 25 15:26 src/Makefile
[unknown]                  913    1767  51.7% -lh5- 6a20 May 25 14:34 src/progress.c
[unknown]                  991    1919  51.6% -lh5- 0576 May 25 15:25 src/raw.c
[unknown]                  225  123392   0.2% -lh5- b115 May 25 14:06 src/test.vdi
[unknown]                 1787    6642  26.9% -lh5- e321 May 25 15:35 src/vdi.c
[unknown]                 1117    2523  44.3% -lh5- 6a02 May 25 15:23 src/vditool.h
[unknown]                  111     190  58.4% -lh5- 734c May 25 16:33 src/vditool_rev.h
[unknown]                  126     236  53.4% -lh5- 80d5 May 25 16:33 src/vditool_rev.i
[unknown]                    2       2 100.0% -lh0- 6795 May 25 16:33 src/vditool_rev.rev
[unknown]                  130     249  52.2% -lh5- a4cd May 25 16:33 src/vditool_rev.s
[unknown]                 1069    2178  49.1% -lh5- 7633 May 22 15:56 src/vdi_format.h
[unknown]                11879   30956  38.4% -lh5- dc7f May 25 16:33 vditool
[unknown]                 1034    2364  43.7% -lh5- ead6 May 25 16:33 vditool.readme
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total        17 files   26961  201395  13.4%            May 25 18:32