Sector not found?

[fexuaz555]

When I make startup disk on setup, setup says sector not found. What is the 'sector'?

I made the 1.44MB image file using UltraISO (with Dos sector) and formatted using the command, format

[user99672]

Vague Post.

Are you strictly talking about a boot sector? Or just any sector on the disk? What are your intentions (as indicated by the wording 'when I make startup disk')? What is 'setup' in this case?

Also, if you're really that confused about disk sectors (which doesn't completely appear to be the case, I think you may have some understanding of it?) read this: http://en.wikipedia.org/wiki/Disk_sector

[Darkstar]

Sector not found indicates that it has not been formatted correctly. Maybe you're trying to write a 3.5'' image to a 5.25'' disk or vice-versa?

[Battler]

When I make startup disk on setup, setup says sector not found. What is the 'sector'?

The emulator you're using does not emulate the FDC format command. This is a case, for example, with PCem (original, not PCem-X, PCem-X has that fixed) and Windows 9x Setup uses it when making a startup disk.