Bios Sega Dreamcast -

Here is why it was so special:

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The Dreamcast’s security is fascinatingly complex. Unlike the PlayStation, which used a wobble groove, the Dreamcast used a combination of a proprietary disc format (GD-ROM—Gigabyte Disc Read-Only Memory) and a BIOS security handshake. Here is why it was so special: #SegaDreamcast