First, the modem is not the computer. It's what connects the computer to your Internet Service Provider. You're asking how much free space is on your hard drive, which is the storage device in the computer. It's like a filing cabinet where programs and data are stored until you tell the computer to run them.
The basic storage unit is the byte, which you can imagine as storing one character. The prefixes kilo-, mega- and giga- are from the metric system:
1 kilobyte (KB) = 1000 bytes (It's actually 1024 bytes because computers work in powers of two)
1 megabyte (MB) = 1000 KB
1 gigabyte (GB) = 1000 MB
So if your drive has 5GB free, there is about 5000 megabytes left to work with, roughly 5,000,000,000 bytes.
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