File Map and Drive Map
The File Map shows the positions and sizes of the file areas.
A file map provides a graphic representation of the
Area Pane and appears for existing
files only (or after the first Save command).
Area is a block of data created as a result of editing operation.
For example, a file just opened consists of a single area of original data.
Changing a byte in the middle of the file converts the layout to three
areas – original data before the changed byte, one byte long modified
area, and an original data area from the changed byte to the end of the file.
Point an area with the mouse cursor to open the area info window;
right-click the area to open the area menu.
There are five types of data areas:
- The original data are shown in green.
Neither the data themselves, nor their position have been changed.
is the color of data shifted up (to the sky). The data are unchanged, but deleting
some bytes caused the area move in the direction of the beginning of the file.
- Light brown
is the color of an area shifted down (to the ground). The area contains the original data,
but the position of the area has been changed as a result of some insertion operation.
- Modified or inserted data blocks are shown in
- Light gray
is the color of a zero area, that is either sparse
zero block, or a block inserted with the Insert Zeros command.
Drive Map is basically the same thing as File Map (both are actually
stream maps). However drive maps are much less useful because in case of drives
we usually have huge streams and tiny modification areas. Drive maps seldom provide
useful information so they are turned off by default.