B&R Industries Provit 5000 User Manual - page 148
Provit 5000 User’s Manual
147
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Controllers • Lifespan of Silicon Disks (Compact Flash, PC Card)
3. Possible number of write/erase cycles per year
(1,280 spare sectors + 23 sectors) * 300,000 accesses = 390,900,000 write/erase cycles per
year
4. Lifespan
390,900,000 write erase cycles per year / 12,088,800 write cycles per year = a guaranteed
lifespan of 32 years
Typical lifespan: 32 years * 3.3 = 105.6 years
12.4.2 Example 2: Continuous Data Storage
An application writes consecutively a data amount on a PC card (e.g. trending).
Specifications: 40 MByte PC card, with 20 MByte system data (operating system, application,…)
and 20 MByte data (application memory), 20 KByte per minute i.e. 20 * 1,024 byte / 512 byte =
40 sectors per minute
Figure 86: Continuous Data Storage