Extended partition how many

Asked 9 years, 5 months ago. Active 4 years, 6 months ago. Viewed 87k times. In the image below, what does Extended GB mean?

Improve this question. Arun Arun 1 1 gold badge 3 3 silver badges 3 3 bronze badges. On systems without Windows, I have no primary partitions at all. But Windows wants to be in a primary partition. I know of no downside to exclusive use of extended partitions.

Add a comment. Active Oldest Votes. Improve this answer. Web-E Web-E Sign up or log in Sign up using Google. Sign up using Facebook. The last logical drive only has its own partition entry listed. The entries for partitions are all zeroes. The Partition Table entry is the only information on the first side of the first cylinder of each logical drive in an extended partition. The entry for partition 1 in each Partition Table contains the starting address for data on the current logical drive.

And the entry for partition 2 is the address of the sector that contains the Partition Table for the next logical drive. The use of the Relative Sector and Total Sectors fields for logical drives in an extended partition is different than for primary partitions. For the partition 1 entry of each logical drive, the Relative Sectors field is the sector from the beginning of the logical drive that contains the Partition Boot Sector. The Total Sectors field is the number of sectors from the Partition Boot Sector to the end of the logical drive.

It is just a pointer which is used to point the next partition. Therefore, the master boot sector not only needs primary partition but also should provide a space to store extended partition data. And the extended partition data can help to find the starting position of the second partition. Therefore, no matter how many logical drives are established in the hard disk, the master boot sector can find each of them according to the parameters of the extended partition.

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