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What is the "the dos compatibility flag" in fdisk?

Fresh5 days ago
Mar 15, 202621217 views
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Problem

I fired up fdisk and got this warning: I didn't even know that my previous Linux installs where DOS-compatible in any way! What changes?! The man page says nothing about it. Thanks for answering.

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Fix for: What is the "the dos compatibility flag" in fdisk?

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Here is your answer. DOS doesn't allow a partition to start (or end) mid-cylinder. It assumes the partition table is corrupt when it sees this, and not only won't boot off of that partition, it won't boot any partition on the disk. Basically, unless…

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