A frame is the basic storage area of the system. Each frame is addressed by its numeric frame ID (FID), beginning with frame 1, and ending at a frame called maxfid. Maxfid is determined by the actual size of the disk and the size of data frames.
The number of bytes for the linkage and data areas of a frame are implementation specific.
Most D3 implementations use 4096-byte (4 KB) frames, with the last 96 bytes reserved for the linkage fields.
The what command contains the size of the data area of the frames on your system under the column heading dfsize. Note that only the data portion shows. For instance, if the dfsize on your system is shown as 4000, this indicates a 4 KB (4096-byte) frame size.
See Also
dump Command, FID, Group, Modulo, u401c User Exit, what Command