how big is a movie file
*Photos based on an average file size of 1.5MB. *PowerPoint based on an average file size of 330kb (10 slides) *Movies based on an average file size of 1.5GB for 1 move. *Songs based on an average file size of 4MB per 1 song. *Note: USB drive memory capactiy is never 100% of stated capacity. Most. USB drive capacity ranges from 90 - 98% useable memory. (e.g. - a 1GB drive.