What is max storage dimensions of a pen drive? and how are they better ?

What is max storage dimensions of a pen drive? and how are they better ?

the max storage is in fact 8 gb! and they are wqorking on creating portable hard drive to allow for more storage. They aren't really better, but they are hastily and portable and good for students.
It tell you when you buy it.usually 512MB, 1GB, or 2GB. Theyre not really much better, unless you want to bring documents around with you, and dont want to email them,