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What is the endurance of the storage media on the Magelis HMIBMI and HMIBSC iPC series that use eMMC?

Published date: 02 July 2019

Issue
What is the endurance of the storage media on the Magelis HMIBMI and HMIBSC iPC series that use eMMC?

Product Line
Magelis iPC:
Box PC IIoT (HMIBMI)
IIoT Edge Box Core (HMIBSC)
IIoT Edge Box Smart (HMIBSC)

Environment
Physical data storage media properties

Resolution
The TBW (Total Terabytes Written - ie. the theoretical maximum amount of data that can be written to the storage device before failure in Terabytes) endurance ratings are as follows:
32GB Capacity -> 30TBW
64GB Capacity -> 70TBW
128GB Capacity -> 85TBW

Examples of typical scenarios of data-logging:

[Scenario 1]
Data of 100 WORD (16-bit) Variables logged every 10s would result in ~519MB of data logged per week.
70,000,000MB ÷ 519MB/wk = 134,874 weeks
2593 years of endurance.

[Scenario 2]
Data of 100 WORD (16-bit) Variables logged every second would result in ~5GB of data logged per week.
70,000,000MB ÷ 5000MB/wk = 14,000 weeks
269 years of endurance.
Capacity (GB) TBW Theoretical time to failure for logging 100 WORDs (years)
Every 10seconds Every second
32 30 1112 115
64 70 2594 269
128 85 3150 327


IMPORTANT:
Though it is unlikely that the drive will fail due to reaching the limits of write endurance from data logging, it is still recommended that data logging be written to removeable media such as an SD Card, USB Memory Stick, or USB external drive in order to keep the eMMC dedicated to running Operating System separately from logging.
 

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