Compactflash Card Life Duration - Mitsubishi Electric QJ81DL96 User Manual

16
CompactFlash CARD

16.7 CompactFlash Card Life Duration

The CompactFlash card has a life duration (a limit for writing data). The following shows
the method for calculating the life duration of CompactFlash card (QD81MEM-512MBC,
QD81MEM-1GBC, QD81MEM-2GBC, QD81MEM-4GBC, QD81MEM-8GBC). Note that
the actual life duration depends on the operating conditions and environment. Use the
following calculation only as a guide to determine the time for replacement.
(1) Life duration calculation
CompactFlash card life
duration (years)
(2) Total writable size
Model
QD81MEM-512MBC
QD81MEM-1GBC
QD81MEM-2GBC
QD81MEM-4GBC
QD81MEM-8GBC
(3) 1 year write size
1 year write size
(GB/year)
The life duration of the CompactFlash card can be found with the following calculation
formula.
= Total writable size (GB)
*1: Refer to (2)
*2: Refer to (3)
The total amount of data which can be written to the CompactFlash card is shown
below.
0.5GB (512MB)  100,000 = 50,000
1GB  100,000 = 100,000
2GB  100,000 = 200,000
4GB  100,000 = 400,000
8GB  100,000 = 800,000
The amount of data written to the CompactFlash card in 1 year can be found with the
following calculation formula.
*4
= {(DS + 1024 + 1536 )
1
+ (DCS + 2048)  DCN
1

+ (ES + 1024)  EN + ... + (ESn + 1024) 
1 1

+ (ECS + 2048)  ECN
1

+ (RS + 2048)  RN + ... + (RSn + 2048) 
1 1
/ (1024  1024  1024)
*3: For the underlined portions, calculate by rounding up to a multiple of 512.
Example) For DSn=600, DSn=1024
*4: Add '1536' only to data logging No.n specified in any of data logging layouts for report.
DSn : 1 record (line) size for data logging No.n
DNn : Number of written records (lines) for data logging No.n for 1 year
DCSn : Header size for data logging No.n
DCNn : Number of file switches for data logging No.n for 1 year
ESn : 1 record (line) size for event logging No.n
ENn : Number of written records (lines) for event logging No.n for 1 year
ECSn : Header size for event logging No.n
ECNn : Number of file switches for event logging No.n for 1 year
RSn : File size of report No.n
RNn : Number of reports created of report No.n for 1 year
Calculation formula
*1 *2
/ 1 year write size (GB/year)
Total writable size (GB)
Calculation formula

 DN + ... + (DSn + 1024 + 1536
1

+ ... + (DCSn + 2048)  DCNn
1

ENn

+ ... + (ECSn + 2048)  ECNn
1

RNn}
16.7 CompactFlash Card Life Duration
*3

*4
)  DNn
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