Bulk 20x 4GB USB 2.0 Flash Drive Wooden Gift Box Free Engraving Wedding PenDrive
4GB → 3.6-3.9GB. Add engraving details at checkout. Factory capacity uses decimal system (1GB=1000MB), while OS uses binary (1GB=1024MB). Actual usable space will be lower. Free Personalization 64GB → 58-60GB.