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© J.C. Kessels 2009

Variables

Variables are little storage areas inside MyDefrag that have a name and a value. They can contain numbers or strings, and can be used in places such as  *  NUMBER expressions and  *  STRING's.

Creating and changing variables

See  *  SetVariable to create and change variables.

Pre-defined variables

MyDefrag has a long list of pre-defined variables that you can use. They are dynamic variables, that is, they are automatically recalculated when they are used.

Program and script

Variable Units Description
MyDefragVersion String MyDefrag version (for example "MyDefrag v4.0b4")
WindowsVersion String Windows version (for example "v6.0 build 6000")
Commandline String Commandline (for example "MyDefrag.exe -r Weekly.MyD")
ExecutableDirectory String Executable directory, the directory where the currently running MyDefrag interpreter is located (for example "C:\Program Files\MyDefrag v4.3.1")
WorkingDirectory String Working directory (for example "C:\Program Files\MyDefrag v4.3.1")
ScriptDirectory String Script directory, the directory where the currently running script is located (for example "C:\Program Files\MyDefrag v4.3.1\Scripts")
InstallDirectory String Install directory, where MyDefrag was installed (for example "C:\Program Files\MyDefrag v4.3.1")
ProcessID Number Program ID (PID), for example "5816"
ScriptTitle String Script title (see  *  Title)
ScriptDescription String Script description (see  *  Description)
Date String Date "year-month-day", for example "2010-12-31".
Time String Time "hours-minutes-seconds", for example "12:27:01".
RunTime String Elapsed real time (wall-time) since the program started, for example "2:05:18".

Current volume

Variable Units Description
MountPoint String Mountpoint (for example "c:")
VolumeName String VolumeName (for example "\?\Volume{08439462-3004-11da-bbca-806d6172696f}")
VolumeType String VolumeType (for example "NTFS")
VolumeSize bytes The size of the volume.
VolumeSizeG Gigabytes
VolumeFree bytes The amount of free space on the volume.
VolumeFreeG Gigabytes
VolumeFreeP Percentage
VolumeUsed bytes The amount of used space on the volume.
VolumeUsedG Gigabytes
VolumeUsedP Percentage
MftSize bytes The size of the $MFT.
BytesPerCluster bytes The size of a cluster.
  • Windows uses disks in blocks called "clusters".
  • Harddisks split the data in even smaller blocks, called "sectors". A clusters is 1 or more whole sectors, which is set by Windows when it formats the disk.
  • The minimum size that a file will occupy is 1 cluster.
  • Very small files on NTFS disks are stored in the MFT, and are then reported as occupying zero clusters.
AverageBeginEndDistance Clusters Average end-begin distance.
  • When Windows has finished reading a file then the harddisk heads will have to move to the beginning of whatever file is needed next. MyDefrag calculates the average distance from the end of every file to the beginning of every other file.
  • A lower number means that the files are better packed together and can be accessed more quickly.
  • The lowest possible average distance can be achieved by sorting by filesize.
  • The formula does not take the disk geometry into account. Harddisks have circular tracks with varying numbers of sectors, but the formula calculates as if the harddisk is a linear list of sectors.
AverageBeginEndDistanceP Percentage

Volume: Files and directories by count

The number of files and directories, fragmented and unfragmented. The percentages are the same number, but as the percentage of the total files and directories on the volume.
Variable Units Description
FILES000N Number The number of unfragmented files on the volume.
FILES000P Percentage
FILES010N Number The number of fragmented files on the volume.
FILES010P Percentage
FILES020N Number The number of files on the volume (fragmented + unfragmented).
FILES020P Percentage
FILES100N Number The number of unfragmented directories on the volume.
FILES100P Percentage
FILES110N Number The number of fragmented directories on the volume.
FILES110P Percentage
FILES120N Number The number of directories on the volume (fragmented + unfragmented).
FILES120P Percentage
FILES200N Number The number of unfragmented files and directories on the volume.
FILES200P Percentage
FILES210N Number The number of fragmented files and directories on the volume.
FILES210P Percentage
FILES220N Number The number of files and directories on the volume (fragmented + unfragmented).
FILES220P Percentage

Volume: Files and directories by occupied size

The size of files without sparse space, in other words the space that files are actually occupying on disk. The percentages are the same number, but as the percentage of the total files and directories on the volume.
Variable Units Description
FILES002N Bytes The size of unfragmented files on the volume.
FILES002G Gigabytes
FILES002P Percentage
FILES012N Bytes The size of fragmented files on the volume.
FILES012G Gigabytes
FILES012P Percentage
FILES022N Bytes The size of all the fragmented + unfragmented files on the volume.
FILES022G Gigabytes
FILES022P Percentage
FILES102N Bytes The size of all the unfragmented folders on the volume.
FILES102G Gigabytes
FILES102P Percentage
FILES112N Bytes The size of all the fragmented folders on the volume.
FILES112G Gigabytes
FILES112P Percentage
FILES122N Bytes The size of all the fragmented + unfragmented folders on the volume.
FILES122G Gigabytes
FILES122P Percentage
FILES202N Bytes The size of all the fragmented files + folders on the volume.
FILES202G Gigabytes
FILES202P Percentage
FILES212N Bytes The size of all the unfragmented files + folders on the volume.
FILES212G Gigabytes
FILES212P Percentage
FILES222N Bytes The size of all the files + folders on the volume (fragmented + unfragmented).
FILES222G Gigabytes
FILES222P Percentage

Volume: Files and directories by sparse size

The size of files including sparse space. This is the size of files normally reported by Windows. It includes the space for empty (unused) blocks of data (in the files) that do not occupy space on disk. The percentages are the same number, but as the percentage of the total files and directories on the volume.
Variable Units Description
FILES001N Bytes The size of unfragmented files on the volume.
FILES001G Gigabytes
FILES001P Percentage
FILES011N Bytes The size of fragmented files on the volume.
FILES011G Gigabytes
FILES011P Percentage
FILES021N Bytes The size of all files on the volume (fragmented + unfragmented).
FILES021G Gigabytes
FILES021P Percentage
FILES101N Bytes The size of all unfragmented folders on the volume.
FILES101G Gigabytes
FILES101P Percentage
FILES111N Bytes The size of all fragmented folders on the volume.
FILES111G Gigabytes
FILES111P Percentage
FILES121N Bytes The size of all folders on the volume (fragmented + unfragmented).
FILES121G Gigabytes
FILES121P Percentage
FILES201N Bytes The size of all unfragmented files + folders on the volume.
FILES201G Gigabytes
FILES201P Percentage
FILES211N Bytes The size of all fragmented files + folders on the volume.
FILES211G Gigabytes
FILES211P Percentage
FILES221N Bytes The size of all files + folders on the volume (fragmented + unfragmented).
FILES221G Gigabytes
FILES221P Percentage

Zone

Variable Units Description
ZoneNumber Count The current zone number (for example "3").
ZoneCount Count The number of zones (for example "6").
ProgressPercentage Number The percentage as shown in the status bar, which is the progress percentage from 0,0000 to 100,0000 for the current zone (floating-point number with 4 decimal digits).
ZoneBegin Bytes The beginning of the zone, the number of bytes from the beginning of the disk.
ZoneEnd Bytes The end of the zone, the number of bytes from the beginning of the disk.
ZoneSize Bytes The size of the zone, the number of bytes occupied by all the items in the zone. Note: this includes unmovable items.
MaxNextZoneBegin Bytes The maximum beginning of the next zone. This is basically the end of the disk minus the number of bytes in items that have not yet been placed.

Zone: Files and directories by count

The number of files and directories in the zone, fragmented and unfragmented. The percentages are the same number, but as the percentage of the total files and directories on the volume.
Variable Units Description
ZONE000N Number The number of unfragmented files in the zone.
ZONE000P Percentage
ZONE010N Number The number of fragmented files in the zone.
ZONE010P Percentage
ZONE020N Number The number of files in the zone (fragmented + unfragmented).
ZONE020P Percentage
ZONE100N Number The number of unfragmented folders in the zone.
ZONE100P Percentage
ZONE110N Number The number of fragmented folders in the zone.
ZONE110P Percentage
ZONE120N Number The number of folders in the zone (fragmented + unfragmented).
ZONE120P Percentage
ZONE200N Number The number of unfragmented files + folders in the zone.
ZONE200P Percentage
ZONE210N Number The number of fragmented files + folders in the zone.
ZONE210P Percentage
ZONE220N Number The number of files + folders in the zone (fragmented + unfragmented).
ZONE220P Percentage

Zone: Files and directories by occupied size

The size of files in the zone without sparse space, in other words the space that files are actually occupying on disk. The percentages are the same number, but as the percentage of the total files and directories on the volume.
Variable Units Description
ZONE002N Bytes The size of unfragmented files in the zone.
ZONE002G Gigabytes
ZONE002P Percentage
ZONE012N Bytes The size of fragmented files in the zone.
ZONE012G Gigabytes
ZONE012P Percentage
ZONE022N Bytes The size of all files in the zone (fragmented + unfragmented).
ZONE022G Gigabytes
ZONE022P Percentage
ZONE102N Bytes The size of unfragmented folders in the zone.
ZONE102G Gigabytes
ZONE102P Percentage
ZONE112N Bytes The size of fragmented folders in the zone.
ZONE112G Gigabytes
ZONE112P Percentage
ZONE122N Bytes The size of all folders in the zone (fragmented + unfragmented).
ZONE122G Gigabytes
ZONE122P Percentage
ZONE202N Bytes The size of unfragmented files + folders in the zone.
ZONE202G Gigabytes
ZONE202P Percentage
ZONE212N Bytes The size of fragmented files + folders in the zone.
ZONE212G Gigabytes
ZONE212P Percentage
ZONE222N Bytes The size of all files + folders in the zone (fragmented + unfragmented).
ZONE222G Gigabytes
ZONE222P Percentage

Zone: Files and directories by sparse size

The size of files in the zone including sparse space. This is the size of files normally reported by Windows. It includes the space for empty (unused) blocks of data (in the files) that do not occupy space on disk. The percentages are the same number, but as the percentage of the total files and directories on the volume.
Variable Units Description
ZONE001N Bytes The size of unfragmented files in the zone.
ZONE001G Gigabytes
ZONE001P Percentage
ZONE011N Bytes The size of fragmented files in the zone.
ZONE011G Gigabytes
ZONE011P Percentage
ZONE021N Bytes The size of all files in the zone (fragmented + unfragmented).
ZONE021G Gigabytes
ZONE021P Percentage
ZONE101N Bytes The size of unfragmented folders in the zone.
ZONE101G Gigabytes
ZONE101P Percentage
ZONE111N Bytes The size of fragmented folders in the zone.
ZONE111G Gigabytes
ZONE111P Percentage
ZONE121N Bytes The size of all folders in the zone (fragmented + unfragmented).
ZONE121G Gigabytes
ZONE121P Percentage
ZONE201N Bytes The size of unfragmented files + folders in the zone.
ZONE201G Gigabytes
ZONE201P Percentage
ZONE211N Bytes The size of fragmented files + folders in the zone.
ZONE211G Gigabytes
ZONE211P Percentage
ZONE221N Bytes The size of all files + folders in the zone (fragmented + unfragmented).
ZONE221G Gigabytes
ZONE221P Percentage

Gaps by count

The number of gaps on the volume. The percentages are the same number, but as the percentage of the total gaps on the volume.
  • The less gaps the better. More gaps will cause more fragmentation.
  • The gap count will increase while defragmenting.
  • The gap count will decrease while optimizing.
Variable Units Description
GAP01N Count The number of small gaps. Small gaps are gaps that are smaller than the average gap size (GAP13N).
GAP01P Percentage
GAP02N Count The number of big gaps. Big gaps are gaps that are bigger than the average gap size (GAP13N).
GAP02P Percentage
GAP00N Count All gaps.
GAP00P Percentage

Gaps by size

Statistics about the size of the gaps on the volume. The percentages are the same number, but as the percentage of the total gaps on the volume.
Variable Units Description
GAP11N Bytes The size of the small gaps. Small gaps are gaps that are smaller than the average gap size (GAP13N).
GAP11G Gigabytes
GAP11P Percentage
GAP12N Bytes The size of the big gaps. Big gaps are gaps that are bigger than the average gap size (GAP13N).
GAP12G Gigabytes
GAP12P Percentage
GAP10N Bytes The size of all the gaps.
GAP10G Gigabytes
GAP10P Percentage
GAP13N Bytes The average gap size.
GAP13G Gigabytes
GAP13P Percentage
GAP14N Bytes The median gap size. This is the size of the gap in the middle of the list of sorted gap sizes. Half the gaps are smaller than this number, and the other half is bigger.
GAP14G Gigabytes
GAP14P Percentage
GAP15N Bytes The size of the biggest gap.
GAP15G Gigabytes
GAP15P Percentage

Unmovable items

MyDefrag initially treats all files as movable, and will only mark an item as unmovable after the Microsoft defragmentation API has refused to move it.
Variable Units Description
UnmovablesList List List of unmovable items. The format of the list is fixed and cannot be changed. It contains 1 line per item (file, folder) with the number of fragments, the number of sparse bytes, the number of occupied clusters, and the full path of the item.
UnmovablesTotalFragments Count Total of the "fragments" column.
UnmovablesTotalBytes Bytes Total of the "bytes" column.
UnmovablesTotalClusters Clusters Total of the "clusters" column.

Fragmented items

Variable Units Description
FragmentedList List List of fragmented items. The format of the list is fixed and cannot be changed. It contains 1 line per item (file, folder) with the number of fragments, the number of sparse bytes, the number of occupied clusters, and the full path of the item.
FragmentedTotalFragments Count Total of the "fragments" column.
FragmentedTotalBytes Bytes Total of the "bytes" column.
FragmentedTotalClusters Clusters Total of the "clusters" column.

The 25 largest items

Variable Units Description
LargestItemsList List List of the 25 largest items on the volume. The format of the list is fixed and cannot be changed. It contains 1 line per item (file, folder) with the number of fragments, the number of sparse bytes, the number of occupied clusters, and the full path of the item.
LargestItemsTotalFragments Count Total of the "fragments" column.
LargestItemsTotalBytes Bytes Total of the "bytes" column.
LargestItemsTotalClusters Clusters Total of the "clusters" column.

Bad cluster list

Windows will add disk clusters to the "$BadClus:$Bad:$DATA" system file when it detects a hardware error. If the list begins to grow then you should immediately replace the disk.
Variable Units Description
BadClusterList List List of bad clusters. The format of the list is fixed and cannot be changed. It contains 1 line per block of clusters with the number of clusters and the LCN (Logical Cluster Number) on the disk.
BadClusterTotal Count Total of the "clusters" column.

Memory usage

Statistics about the memory in use by the program.
Variable Units Description
MemoryHeapBytes Bytes Heap memory
MemoryHeapItems Count Heap items
MemoryVolumes Bytes Volumes
MemoryItems Bytes Items (files, directories)
MemoryFileNames Bytes Filenames
MemoryFullPaths Bytes FullPaths
MemoryExtends Bytes Extends (fragments)
MemoryContext Bytes Context

Example

# Set very basic statistics.
SetStatisticsWindowText("
  Total disk space:   !VolumeSize! bytes
  Bytes per cluster:  !BytesPerCluster! bytes
  Unfragmented Items: !FILES200N!
  Fragmented Items:   !FILES210N!
  Unfragmented Data:  !FILES202N! bytes
  Fragmented Data:    !FILES212N! bytes
  All Gaps:           !GAP00N!
  All gaps:           !GAP10N! bytes
  Average gap:        !GAP13N! bytes
  Median gap:         !GAP14N! bytes
  Biggest gap:        !GAP15N! bytes
  ")

See also:

 *  SetVariable
 *  Macros
 *  Settings