Felix Miata asserted on 2022-06-09 23:25 (UTC+0200):
Siard composed on 2022-06-09 16:03 (UTC+0200):
A disk drive can contain a maximum of four primary partitions or three primary partitions and a single extended partition.
Every one of the four entries in the portion of "the partition table" contained in the MBR represent a definition of one primary partition. Therefore, all entries in the MBR are primaries, including the extended.
Several sites state otherwise. "On a MBR disk, there can only be maximum 4 primary partitions or less than 4 primary partitions plus one extended partition." https://www.diskpart.com/resource/disk-partition-basic-understanding.html "Primary and extended partitions are the main disk divisions; one hard disk may contain up to four primary partitions, or three primary partitions and one extended partition." https://www.werockyourweb.com/office/equipment/hard-drives/partitions/ "A standard master boot record (MBR)-based hard disk can contain up to four primary partitions or three primary partitions and one extended partition." https://docs.microsoft.com/en-us/windows-hardware/customize/desktop/unattend... "A disk drive can contain a maximum of four primary partitions or three primary partitions and a single extended partition." https://www.differencebetween.com/difference-between-primary-partition-and-v... Etc. etc.