About the most convenient way these days to move files from one laptop to another is to use a USB flash drive. There are several phrases associated with that concept in Russian, among which are флеш-накопитель "flash storage" and флеш-память "flash memory", but in common usage you will mostly hear флешка or флэшка. It looks odd to Russians to see the letter э anywhere aside from the first letter of a word, so I'm guessing in the long run the флешка spelling will win out. In either case, be sure to pronounce the л hard, not soft, no matter which spelling you use.

Probably the most common question about flash drives is how much data they can hold. The way to ask the question properly is:

It's also possible to say things like:

I was amused to find out that sometimes geekoids will substitute the word гектар hectare for гигабайт gigabyte:

Last but not least, you might also hear something like:

Those versions look awful in print. Don't ever write them in an official document or course paper, but don't surprised if you hear them when friends are talking among themselves.