Media Descriptor File.
MDF = Master Database File
The full form of ID is "Identification". It is used to refer to a document or card that proves a person's identity.
identification
IDENTIFICATION
E-Mail ID = Electronic Mail Identification Directory
I.D. = identification bg: background
Identity Card
Business Executive Program
Joint Photographic Experts Group
i.e. stands for "id est ( latin), means that is."
mdf is strong but not very strong