Hatteland HD 12T21 MMC Series, User Manual

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96 Appendix
IND100077-130
SSD Selection Guide
Solid State Disk (SSD) Devices
Last revised : 4 November 2014
SSD's has many benefits over conventional hard drives, but when it comes to write
endurance it is important to choose the technology to be used with care. It is of very high
importance to consider several aspects when using an SSD for a particular
application, below the most critical ones, such as:
- Nature of the application, data written to disk during a defined time period (worst case).
- Operating System (OS) and applications settings, optimized for SSD.
- SSD selection, there are several choices of price and performance.
- Expected system life, using worst case calculations.
SSD devices have limited life time. The life time of the SSD device is direct dependent of the application software.
- Selection / dimensioning of SSD device is required for each unique application.
- Selection / dimensioning of SSD device have to be done of the system house.
- Selection / dimensioning of SSD device shall be done towards data rate , size of footprint is
secondary and in most cases not the dimensioning factor.
Hatteland Displays Recommendations, MLC device
Use of OS image adapted for HDD without any modifications for SSD:
> Do not use SSD.
Basic SSD configuration of OS but not considered SSD in application SW and no estimation of
amount of written data:
> Do not use SSD.
Basic SSD configuration of OS and basic consideration of SSD in application SW. Estimation based
at guess, but actual amount of written data not known:
> Select next larger device, i.e if calculation gives 80GB, select 120GB instead.
> Minimum size 80GB.
Actual data known, based at measurements at actual application, running in worst case scenario:
> Select device according to calculation.
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