These 5 flash drives are meant to hold 2GB. I've tried two and they only fit about 13 megabytes before they stop adding data. The warning states that some of the 13 megabytes should be deleted. add more data to the hard drive even though the hard drive is almost empty. The disk information shows only 13 megabytes out of 2 GB. I'm using IMAC, not Windows. Maybe they are not IMAC compatible or I have some bad flash drives. UPDATE: Today while testing the rest of my drives, Imac informed me that I have options to optimize these drives. This came as a surprise to me as most of the products I buy are IMAC powered and plug and play. These 5 flash drives are not. I had to erase, rename and reformat all 5 drives. Everything went quickly, but these 2.0 flash drives boot very slowly. Now that they all have to work with IMAC, I can use them, but only for very small amounts of data. I've been using an IMAC for over 8 years and have bought several flash drives but these 5 are the only ones that didn't work out of the box on my IMAC.
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