Our new partition should end on a cylinder boundary. This means that it will end on some cylinder, head 254, sector 63. But which cylinder?
Here, you have to resort to some basic math. No, stop screaming; it isn’t that bad: Just get out your calculator. This hard drive has 2,591 cylinders and can hold about 20GB, or 20,000MB. Each cylinder holds roughly the same amount of data. 20,000MB divided by 2591 cylinders equals a little over 7.719MB/cylinder. Dividing the desired partition size in megabytes by the actual MB/cylinder ratio shows that we need 1,036 cylinders for OpenBSD. The first partition goes through partition 891. 891 + 1036 = 1,927, so our OpenBSD partition will end on cylinder 1,927.
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