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Inside the miniSD-to-SD Adapter and the microSD-to-SD Adapter

> It turned out that the two shorter middle pins on the miniSD cards aren't used. Now I wonder what they are for.

Apparently they are reserved for future use and not connected. See:

Flash card adds functionality to mobile phones

I would be interested to see the pictures of the microSD adaptor internals if you have some.


Ian Dimond

Ian Dimond
Thu, 10 Aug 2006 07:22:35 -0700

Ian, I took some a few weeks ago . . . just been too busy with chores. Let me find some time to post them this week.

Chieh Cheng
Thu, 10 Aug 2006 09:48:58 -0700

I can't seem to find the photos I shot before. Maybe I just thought I shot them. Anyway, I took pictures today and have posted them in the article.

Chieh Cheng
Fri, 18 Aug 2006 00:32:19 -0700


I've found the transflash pinout on SanDisk's web site here:

SanDisk TransFlash Memory Module

Like you said, there is only one ground pin.

Can you tell what the odd looking pair of contacts going up the side of the card are? They look a bit like switch contacts. Are they connected to anything or are they just there to hold the card in place?

Ian Dimond
Fri, 18 Aug 2006 02:37:21 -0700

At first I thought they were a pair of contact switch as well. But after close examination, I see that they are connected to each other before going under the black plastic. I believe they are there to provide a soft latch for the microSD (TransFlash) card.

Chieh Cheng
Sun, 20 Aug 2006 01:29:00 -0700


Ian Dimond
Mon, 21 Aug 2006 08:25:49 -0700

Wonder if this helps. Perhaps you could use a multimeter or any device that allows you to test the "continuity" of circuits. You could then use this to trace the pins of the microSD - SD adapter.

Tue, 26 Sep 2006 11:08:01 -0700

My MicroSD to SD adaptor has a write protect switch on the side that the MicroSD card doesn't have, so could one of the contacts just be a write protect?

Wed, 18 Oct 2006 16:56:17 -0700

Have you managed to find a micro-sd to mini-sd adaptor? I would also really like one of these as I have a number of micro-sd cards which would be useful to use in my PDA which takes a mini-sd card. Thank you.

Mon, 29 Jan 2007 09:32:30 -0800

Yup, found the adapter. See the "microSD-to-miniSD Adapter" TrackBack below.

Chieh Cheng
Mon, 29 Jan 2007 10:56:38 -0800

Ohm meter. you can see which pins are connected by checking the connections. if you don't have that, you can rig up an led and a battery to see the connections.

Mon, 19 Feb 2007 22:37:19 -0800

do u think it is possible to make an sd to microsd converter where in the data is stored on the sd and it is connected to micro sized card for use in phones etc

Sun, 10 Jun 2007 02:32:25 -0700

Sure, Dradsa, the adapters are just pass-through connectors. Your idea should work just fine.

Chieh Cheng
Sun, 10 Jun 2007 12:07:25 -0700

I recently started work on a SD to TF adapter since my TF(microsd) recently bit the dust. So I stumbled upon your site and it helped me a bit. Thought you might want this. It is a detailed picture of the inside of that micro SD to SD adapter.


Attached Image:

Detailed Inside.JPG

Harrison Wideman
Thu, 27 Sep 2007 17:52:57 +0000

great work, this is very helpful to me. i need a computer chip for a short film and was trying to figure out how to take apart an SD card w/out destroying it. I didn't realize you could unclip the plastic, awesome.

Mon, 24 Nov 2008 23:34:34 +0000

This was a great help in helping me understand the use of adapter! Thanks

Wed, 12 Aug 2009 02:43:08 +0000

I've carelessly open my miniSD adapter and I lost something so that the remaining is just 3 part as you can see in this photo.
My PC read it as read-only.
Some picture on internet could not help me to know what to do to make it write-enable again..
Can U help me?

Attached Image:


Mon, 11 Jan 2010 11:07:52 +0000

You lost the write protect tab. You can use a piece of tape in its place. See the "memory card locked" thread.

Chieh Cheng
Mon, 11 Jan 2010 22:39:50 +0000

u could have done a connectivity test with a multi meter.

Thu, 17 Feb 2011 05:03:54 +0000

��y bạn �i MicroDS to MiniSD

Attached Image:

1 microsd to minisd.jpg

duy ph��ng
Mon, 19 Sep 2016 14:25:57 +0400

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Title: TransFlash (microSD) in miniSD slot?
Weblog: Camera Hacker
Excerpt: I have been looking for an adapter for using TransFlash (microSD) card in miniSD memory card slot. But have yet to find one. Any one know of such an adapter?
Tracked: Tue, 05 Sep 2006 11:20:55 -0700

Title: microSD-to-miniSD Adapter
Weblog: Camera Hacker
Tracked: Mon, 02 Oct 2006 16:16:39 -0700

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