FDC Gap Length?

Hi Dave You have to remember that 100 bytes are easily within the variation in speeds of the drives. As was mentioned, the gaps between the sector headers and the data need to be long enough to take up the relock time of the pll's. The gaps between sectors need to take up this time, along with the worst case speed difference on different drives. The last gap is just filled to the index. It also needs to be big enough to take up any speed differences. When I did a format for my NC4000 board, it seems like I got most of my information from looking at the format code on my PC. I did worst case calculations for the gaps between sectors and used the same values for the gaps between sector headers and data as the PC used. These were relatively fixed for the different densities. Dwight