I need to choose a write filter for my windows embedded device. What are the differences?
Tuesday 07 February 2012
Enhanced Write Filter
This protects the disk, as entirely all disk writes are written to RAM and are lost after a power down or reboot. This is an excellent option if you don’t need any persistent storage or are writing to a network. (The layer can be disabled to allow application and configuration changes). In addition to this, the Enhanced Write Filter also has a function called HORM (Hibernate Once Resume Many), which allows a rapid reboot and return to the same hibernated image over and over again.
File Based Write Filter
This protects the majority of the file system, as it only allows disk writes to be made to specific files and folders. This is an excellent option when you have historical log files or recipe data that need to updated.
No Write Filter
All files and folders can be written to without restriction; this is of course the easy option but bear in mind if you write a lot of data to the disk that the compact flash may start to deteriorate.