Some machine brands are touchy about which specific sticks they can read. Ask your Bernina dealer which brand and size of sticks you can use. If the stick memory is too large, this causes the machine to struggle. It is not a specific problem with Bernina, as I have had trouble with Janome.

Some machines require the usb stick to be formatted in the machine before you place any designs on them.

Can you look at the USB stick you used to use and see if there's a file you don't recognize. For my HV Ruby the stick needs to be formatted for the machine and that puts a .idb file on it and the ORD and EMB folders - see picture.
Designs are put in the EMB folder and everything else I want to save I put in a new folder, called data on this one. The machine only shows the EMB folder.
For my other machine that uses .jef that idb file is found in every folder, not in the menu.
Your user's manual should tell you how to format a USB stick that did not come with the machine.

if you put the designs in folders, the machine will not read it, or if too many designs, too big for the machine memory to read it all. Hope it helps

Sounds like the memory stick may be too large. I remember years ago when I could only use a stick no bigger than 1gb if you tried using a 4gb if wouldn't work.
Or as someone said if it isn't in the emb file.

This happened to me too. I formatted the stick in the FAT format in my computer and was then able to use it. Also, make sure you didn't load zipped files. (Ask me how I know that doesn't work)

Many machines will not work with a datastick over 12GB, I prefer 8GB on brother, hope the info helps you.

My Deco 340 doesn't care if I use a large memory stick, but as others said, it must be formatted to an emb folder that will hold your design. Hope you figure it out soon.

I also have a Deco 340 and these machines will not read a Memory stick with a large capacity! Try using the smallest one that you can find & use that for just your Deco AND delete everything once you have completed your projects so that you have an empty stick for your next project!
You will find it will also open up quicker in your machine!
ALSO : your designs should be in a file named EMB when trf from your software to your stick - this file is automatically created by your software! IF NOT your Deco will NOT recognize/be able to read the designs!

Sarah, did you get this sorted out and now are you able to use your memory sticks?

I send all off the stick to an external hard drive then I can keep on using one usb stick No problem:):)

Sarah hope you have some answers that help. After doing ME for over 15 years one would expect it to be straight forwards but seems not to be the case. I too have been having problems dl designs that then dont open... Life is fun

Since writing my post a dear friend has given me a very old memory stick. I reformatted it and it works perfectly. I just do not understand it at all. Thank you all for your time. Flowers for all.

Hi Sarah,
only thing I can think of is: new sticks are to big (over 4MB) or have new usb (3.0) and your machine has 2.0. Donot nail me on this, but I think in one of my manuals it said 4MB limit to usb. If this is right ???? keep those 4 MB sticks save gals!!!! Hope some smart cokki can figure this out.

You can find 1G usb sticks in many places. I got some from Amazon

Hi Sarah,
There are more than one USB thumb drive systems. Most often we use USB2, but they are now making mostly USB3. The difference is not the actual size that goes into the machine - it is the speed at which they can transfer data. There is a chance you have USB3s trying to be read by sewing machine that reads USB 2s. So.... my recommendation is to find some UDB2s as they are still available. Give that a try!

My Brother can easily read from a card that is 128GB.

Sarah, did you figure out what was going on? were you able to solve your problem?