This is my partition table. Output of fdisk -l

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *          63   204796619   102398278+   7  HPFS/NTFS/exFAT
/dev/sda2       204796681   488375999   141789659+   f  W95 Ext'd (LBA)
/dev/sda5       204796683   337911209    66557263+  83  Linux
/dev/sda6       337911273   488375999    75232363+   7  HPFS/NTFS/exFAT

I need to understand the partition table especially /dev/sda2 which shows Ext'd (LBA).

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    Have you read at least the Wikipedia article about partition tables? – Hauke Laging May 30 '13 at 18:58

The DOS partition table only has room for 4 entries, so to have more than 4 partitions, you can designate one of the 4 as an extended partition, then that partition can itself be subdivided into as many logical partitions as you want. Logical partitions are numbered starting with 5.

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Here read these references:

From wikipedia

Comparison of MBR vs. GPT

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