Using CitectSCADA > Logging and Trending Data > Using Trend History Files > Calculating disk storage

Calculating disk storage

Equations allow you to calculate the total disk space necessary to store a trend across a specified period of time.

Note: The storage method used for a trend (Scaled or Floating Point ) affects the number of bytes necessary for each sample, so in order to calculate the disk space necessary correctly it is important to base your calculations on the appropriate formula.

To find out which storage method a particular trend is using, refer to the extended Trend Tag Properties dialog. (By default, the Scaled storage method is used.)

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