SingleBoardComputer

Recently, as PC performance and the requirements for all related parts have increased embedded system architects have had a goal of  minimizing current and future design risks, lowering product life-cycle cost through module scalability, interchangeability and planning smooth transition from legacy to legacy-free interfaces while allowing room for growth.

Compatibility concern

To deal with this issue manufacturers have added SATA on the board as an option, but designers are not able to take advantage of the SATA technology  at this level due to the lack of incompatible approaches and standards. The use of a single HDD could  have a high chance of failure.

Four Logical Options

Compact Flash (CF)

USBFlashdisk

Pros Cons
Standard factor Bulky in size
Very Mature Product Slow  interface& Slow Boot Time
Widely used by consumer application IDE form factor
Removable sockets No component control  for industrial applications
Industrial embedded Solid State Disk Lots of variables, which cause reliability issues

 

USB Flash Disk Module

USBFlashdiskmodule

Pros Cons
Consumer Interface Needs to load driver before it can be used
Built-in wear leveling Slow boot speed
Industry-standard package Support issues
Universally standard computer interface Restricted Bandwidth
Features  cross-platform Numerous USB expanders
Serial and parallel connections Streamline effect
Hot swappable interface
Removable and rewriteable
No moving  parts

 

Disk On Chip

Disk on Chip

Pros Cons
Standard form factor Bulky in size
Very mature product Slow interface
Widely used by consumer applications IDE form factor
Removable sockets No component control  for industrial applications
Industrial Embedded Solid-State Disk Lots of variables, which cause reliability issues
Slow boot time
Limited file opening  systems (FAT files)
Various drivers needed

SATA Module

SATA Module

Pros Cons
Ease of adaptation  Needs to load driver before it can be used
JEDEC SODIMM socket     Slow boot speed
Fast boot time and access time Support issues
Ideal  for OS and needed capacity for onboard data storage Cost based on DRAM price fluctuation
SATA interface speed: 2x to 4x IDE/CF,USB, or DOC flash speed Above 2 GB density
DDR SODIMM or SATA module share same socket Limited to 2 rank at this time
Eliminates space designed with consumer storage cards; CF,SD,USB, and the like
Real estate for the existing  onboard memory can be used for other board functions
No changes to DDR SODIMM socket and pinouts design
Available with DDR2 or DDR3 technology