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Support for Micro SD Card > 2 GB

MicroSD SD SDHC SDXC FAT12 FAT16 FAT32 exFAT

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#1 TechnoGuy

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Posted 10 September 2015 - 04:16 PM

Hi Chris,

 

The Netduino 3 family of development boards has recently been released.  I note from the Netduino 3 hardware specifications page that, under "Storage" (Micro SD Cards) the limitation continues to be 

"up to 2 GB"

 

(i.e. it is the same as for Netduino Plus 2).

 

This is a bit of a problem for me as I'm finding it more & more difficult to find Micro SD cards at this size given the progression of technology.  I'm finding that you can still get these low capacity cards but there is a price inversion and they are becoming more costly than 4 GB cards, given that scarcity has come into the equation.

 

I have seen a few other postings in the Netduino forums that at least mention this problem:

In one of your responses (March 2013) you talked about the potential for upgrading capacity to > 2 GB in a future release.

 

I'd like to ask where things are with this?

 

My understanding is that there are (currently) 3 different SD family standards:

  • (Original) SD Standard:  up to 2 GB using FAT12 & FAT16 filesystems
  • SDHC Standard:  > 2 GB - 32 GB using FAT32 filesystem
  • SDXC Standard:  > 32 GB - 2 TB using exFAT filesystem

So I guess what I'm really asking is "What is the potential for Netduino to support SDHC in the near future?"  Is this a hardware limitation or (I'm hoping) is it just Netduino firmware &/or the current NETMF implementation?

 

By the way - for my intended use (the irony of the situation), my data storage requirements are actually far less than any of the capacities mentioned.

 

Ian


- Ian

 

My Current Dev Boards:

  • 3 x Netduino Plus 2
  • 1 x Netduino 3 WiFi

#2 Riaan Mastenbroek

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Posted 19 February 2016 - 08:19 AM

Hi,

 

I am having the same issues and I cannot get any more 2GB SD cards in south africa. The only 2GB's that I can get is very expensive and have to import many to secure an order.

 

I tried a 4 and 8 but it just does not read. What is the status of this issue, can anybody recommend a work around to perhaps get the 4 or 8 Gb working?

 

Please, I am desperate. My company is growing and I now have 15 units running in production at various places in SA. I now need to deploy an additional 10 and only have 7 cards left....

 

Just as a note or comment, I LOVE this little product and it is working really really well under adverse conditions such as high temperatures.

 

Riaan



#3 TechnoGuy

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Posted 19 February 2016 - 09:07 PM

I wound up purchasing some no name (lesser name "Aura") 2 GB Micro SD cards on eBay back in September 2015.  I bought 3 of them for a total of $8.16 USD and I think that actually included the shipping as well.  They all work but I suspect they've undergone less testing than / may not be as reliable as the brand name alternatives.

 

With regard to support for modern Micro SD cards (i.e. SDHC / SDXC - those having capacities greater than 2 GB) on the Netduino, I do not at this point expect that to happen anytime soon.  From what I've read, it was limitations in the early implementations of the .NET Micro Framework (i.e. software, not hardware).  I don't know if perhaps they've addressed it in NETMF 4.4 but it's unclear whether NETMF 4.4 will ever be made available on the Netduino.


- Ian

 

My Current Dev Boards:

  • 3 x Netduino Plus 2
  • 1 x Netduino 3 WiFi





Also tagged with one or more of these keywords: MicroSD, SD, SDHC, SDXC, FAT12, FAT16, FAT32, exFAT

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