Brother uses .pes format, Janome .jef format. I don't know what Bernina machines accept. Most downloadable embroidery zip files have 10 or more formats. you pick out what you need. My machine has an USB slot. Smaller USB sticks (128MB) will store dozens of patterns and take a lot less time to show up in the embroidery machine as do 4 GB. A USB stick with the Brother logo is advertised at over $20. On line you find plain ones for 2-3 bucks.