Figure 4. Expanded View of a Single Sector
Figure 4 illustrates an expanded view of a single sector on a diskette formatted
for the 2031. In addition to other information, each sector contains a data block
consisting of 256 stored characters. Blocks within the same file are linked
together by means of a two-character block pointer. By pointing to the location
of the next data block, block pointers enable the system to retrieve data from
non-contiguous blocks. Retrieving the first data block within a file triggers a
search for the next data block which, in turn, utilizes block pointers to locate
related blocks until the entire file is assembled and made available for display.
All PRG, SEQ, and USR files utilize this format.
53
To Next Page
Loading...
