Linked by Thom Holwerda on Mon 12th Jul 2004 08:45 UTC
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"I believe on i386 a bootloader mustn't be larger than 512K - the size of the first sector. You can't quite do something exactly marvellous in 512K of space."
A sector is 512 bytes, not 512 kilobytes, which is why most boot loaders are written as two (or sometimes three) stages. If you use the first track of the hard drive (15 MB in my computer), you have enough room for a small operating system, or at least a nice boot loader.