Hardware manual

Chapter 1 Windows XP Embedded
1-9
 Write Filter-related important notes
• If the Write Filter is enabled, when writing to the CF card, data is written on the memory. When deleting
the data on the memory, some data may remain. However, it will be deleted after rebooting.
• Even if the CF card has an avaiable area, when the memory has no avaiable area, writing data causes the
disk’s insufficient available area error. And when the memory has a avaiable area and the CF card has no
avaiable area, the Writing Error occurs and data cannot be written. When writing data, be sure to check
avaiable areas of the CF card and the memory.
Ex.) With the Write Filter enabled, when writing 10-MB data,
<Conditions to write 10-MB data>
• The appearing avaiable area in the CF card is 10 MB or more
• The memory’s available area: 10MB + memory’s available area necessary for OS to operate properly.
<State after 10-MB data is written>
• The appearing avaiable area in the CF card decreases by 10 MB.
• The avaiable area in the memory decreases by 10 MB.
<State after 10-MB data is deleted>
• The appearing avaiable area in the CF card returns to the state before 10-MB data is written.
• The avaiable area in the memory does not change from the state when data is written.
• Writing large amounts of data will decrease the available memory. Therefore, during work, it’s necessary to
refrain from writing into the CF card as much as possible.
In order to solve this problem, RAM Disk is installed in XPE made by Pro-face.
In the RAM Disk, the area for the specified size can be used as a volatile disk area. Therefore, that area can be
used again and again when writing directly into the memory area whether the Write Filter is enabled or not.
For details and settings of the RAM Disk, refer to the following section.
)"6 Solve the memory leak caused by the Write filter" (Page 1-12)
Used
Area
Used
Area
Used
Area
Avaiable
Area
Avaiable
Area
Avaiable
Area
CF card
Before
writing
After
writing
10MB
10 MB data
Memory
Memory