Title: +038=360.000-OU045T_02-PCD2.m4160 PLS SBC - File system Manual.pdf
2-4Note that during the compression algorithm the Saia PCD® must not be switched off. Switching of the Saia PCD® while compressing can lead to data loss or a corruption of the file system.In order to avoid excessive compress activity (leading to a fast wear-out of the flash and to frequent state “busy” due to compression) the following maximal memory usage of flash devices is recommended:■ 50% of the size of the device in case data is written by the user program (e.g. log files) 1) ■ 80% in case files are stored statically only (for Web Server access only)The compression of a flash device can take up to several minutes depending on the amount of sectors that are to be compressed (about 4 seconds per sector on a PCD7.R55xM04). During this time the flash device is marked as “busy”.A compression algorithm does always compress all sectors that contain “freed” memory of the device.