text: HD = hard drive.\n\nIt is a storage system for your computer. It is located inside the motherboard of your computer. It is the "brain" of your system and it stores a lot of data and information. It is the memory of your computer that you can store large amount of data and it will keep it in there until you want access to them. It is internal, but it can also be external. Your local harddrive is normally your local memory thats internal and it might have stored your O.S (for example, Windows XP, Windows 98, Windows NT) and other programs that you have stored into it. It is generally referenced as your C: drive.\n\nAlso, the hard drive goes by different memories. The bigger the memory, the more you can store things in your computer like programs and games. They go by megs or gigs. One mp3 song that you download is about 4-5 megs. Nowadays, computers come with gigs of memory. Every 1 gigabyte of memory is equal to 1024 megabytes.\n\nIf you have any more questions, just contact me =)