Each harddisk may contain up to 4 primary.

Cox SMTP central <[email protected]> Sun, 2 Jun 2002 01:22:32 -0400
Newsgroups gmane.org.user-groups.aclug.announce
Message-ID <[email protected]>
In theory, there is no limitation in the number of extended partitions on a harddisk. However, as written above, many operating systems cannot be started from this kind of partitions. That is why these partitions are mostly used to store user data only.

There are further restrictions caused by historic design limitations. The PC BIOS addresses harddisk sectors by the so called CHS (cylinder-head-sector) addresses. In the early days of PCs, harddisks were really built up that way, but later on,  this way of addressing was only used to keep the operating systems compatible.

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