Odd that it didn't work..
Why didn't they give you #cylinders? That's the most important. You really don't have enough information to figure it out, unless you know what format means "formatted", or how many inches of used surface there is....
In this case, if 512 bytes is one block, then there is one block per sector, and 17 sectors per track, so, 17 blocks per track. 4 tracks = 1 cylinder, so 68 blocks per cylinder.
