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700MB/80min CDs are actually only sold as having a 700MB capacity. Their true capacity, including ECC data (for error correction checksums), is almost exactly 803MB. With overburning, you can easily fit 810MB or 815MB of raw data on a "700MB" CD. Often, CD image files are such raw images, so they appear larger but will still fit, often with room to spare.
The 700MB specification is based on each sector on the CD holding 2048 bytes of user data, but in addition there are 304 bytes of ECC data, so each sector really holds 2352 bytes.
700MB / 2048 * 2352 = ~803MB
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