Rockwell Automation 6181P-xxxx Integrated Display Computers, Series A to D - Manual (Page 67)

Publication 6181P-UM001G-EN-P - July 2008 67
Solid State Drive Appendix D
Application Example Two
The OS is updating its FAT table and root directory twice a second.
This update requires one block of memory (128 K). Every write
regardless of location writes to a single block. In this case, wear
leveling is limited to 1 zone (512 blocks).
Use this formula to calculate expected life:
(Flashblocks x Write cycle limit) / [(2 block/sec) x 31,536,000/yr)]
(512 x 2,000,000) / [(2block/sec) x 31,536,000 sec/yr)] = 16.2 yrs
Normally in a Windows operating environment virtual memory is
used, also known as a ’swap file’ or ’page file’. The OS may read from
and write to this file often in a short period of time. Although the
space used could be small, an entire block of memory is required. On
systems using solid state memory, it is recommended that this feature
be turned off.
Maintenance Under normal operating conditions, scheduled maintenance is not
required. The integrity of data stored on a solid state drive is good for
up to ten years.