If you’re reading this post then chances are you already know that recently Sandisk have released a batch of 128GB Extreme Pro UHS-1 cards which are for some reason incompatible with Sony UHS-2 slots.  This affects all generation 3 cameras.  So at time of writing, that is the Sony A9, A7r3 & A7iii.

Inserting a card into slot 1 will give you the dreaded “Unable to read Memory Card – Reinsert memory card slot 1” message.

Sony are aware of this and their engineers in Tokyo are looking into the matter but there is no further news as yet.

It seems this problem is limited to a certain batch of cards.  You can tell if your card is affected by looking at the reverse of the card.  The affected batch number ends in 766G.

Recently Amazon did a great promotion and many photographers, myself included purchased a few.  None worked.

Today I contacted Sony Pro support who could only acknowledge the problem and recommend I return them.

So I contacted Sandisk on their Live chat support.  https://kb.sandisk.com/app/chat/

I explained the situation and they are well aware of the issue.  Their solution was to tell me to create an RMA and they would replace them with…wait for it….the UHS-2 version!

So if like me you are having issues. I would STRONGLY recommend you contact Sandisk and see if they will be so kind too.

Just to help you along, you will need the following URL to raise the RMA request: https://kb.sandisk.com/app/rmaform

*Tip* – For the Product, you will need to click the twisty to select the correct card.  There are sub categories.

You will also need to take photos of the front and back of the SD card(s).  And a copy of your invoice. If like me you got it from Amazon, here is how you can get a copy (in case you didn’t already know).

In the “RMA reason for request” field, apparently writing: “Writing Sony A7 and A9 Slot 1 incompatible” is sufficient.

Once you’ve submitted your RMA, you should get an automatic email with your RMA number and Sandisk will approve the return in due course.  I’ll update this when they’ve updated it and will keep you posted.

Lastly, please bear in mind that this is what Sandisk have told ME.  I don’t know if this is a general policy or not. Whilst I hope this information helps you and Sandisk are kind enough to replace your cards with the much faster UHS-2 version, I cannot guarantee anything.  And whilst I’m always happy to help, please email me instead of using my contact form.  Thanks