Well the 1 gig stick can not hold 1 gigabyte, this is because of confusion to what a Megabyte really is.
The 32MB memory stick included in the Sony PSP package may be large enough for saved games and a couple of pictures, but you'll need to get a higher capacity memory stick if you want to get movies or a large MP3 music collection onto your PSP. Memory stick capacity can range from 32MB all the way up to 2GB, but the most popular sizes have to be the 512MB and 1GB models. You can compress a movie to fit onto a 512MB stick just fine, but a 1GB stick will give you more room for better quality video and additional space for other media files.
Note that "512MB" and "1GB" memory cards don't actually have 512MB and 1GB of software storage capacity respectively. Cards marketed as "512MB" actually only have 468MB of usable memory and "1GB" cards only have 969MB due to formatting overhead and differing definitions of what "megabyte" actually means. According to the storage manufacturer a MB is 1,000,000 bytes, but for software, a MB is 1,048,576 bytes. Don't be surprised when you can't fit that 500MB movie onto your 512MB card.
There aren't a whole lot of major memory stick manufacturers out there. You'll find Sony, SanDisk, and Lexar branded sticks in retail and online stores. You can get a 1GB stick for about $100, but manufacturers also make "High Speed" versions that can cost much more than the normal models. We wanted to see if there is actually a difference in transfer speeds, so we gathered together a selection of 512MB and 1GB memory sticks from Sony and SanDisk to see how fast we could move files onto each stick.
We compared the 512MB and 1GB models from SanDisk's "gaming" line against a normal 512MB Sony Memory Stick Pro Duo and a 1GB "High Speed" Sony Memory Stick Pro Duo. We first transferred a 384MB file to and from the memory sticks using a SanDisk USB 2.0 12-in-1 ImageMate flash card reader/writer, and we then conducted the same transfer tests writing to and from our memory sticks using a Sony PSP and a USB cable. We also put the 1GB sticks through an additional test using a larger 769MB file.
This post has been edited by corbenik the rebirth: 08 July 2005 - 10:16 PM