Each data sample requires eight bytes of storage. This alters the equation to:
| Bytes necessary for each trend | = 704 x No. Files + 160 + |
|
File Period (secs) x (No. Files) x 8 |
|
| Sample Period (secs) |
The number of bytes necessary then becomes:
| Bytes necessary = 704 x 5 + 160 + |
|
(7 x 24 x 60 x 60) x 5 x 8 |
|
| 10 | |||
| Bytes necessary = 2,422,976 bytes | |||
Note: The calculations above do not take into account the space necessary to store the history file for each trend. This is because these files remain at a set size and therefore do not significantly impact the amount of disk space necessary.
Note: For efficient trends storage, use Windows file compression. By using this method you often can reduce your files to 10% of their original size; the actual amount of compression varies depending on the rate of change of the data.
See Also