There's a limit to the number of primary partitions per drive, 4. In order to get more than 4 drives out of one (if this takes your fancy) then you use an extended partition. To a low level program which doesnt speak fluent windows, everything on your extended partition appear as a single drive. Other than this their is no real advantage to extended partitions over primary partitions, but at windows level no significant disadvantage either
Ther can only be one Extended Partition per hard drive
Basic
Primary Partitions are logical areas on Coputer storage devices that have direct reference in Master Boot Record. (Due to limitation imposed by MBR only four primary partitions can be created). While Extended partitions refer to logical areas created out of need for more than four Partitions.
On MBR partitioned hard-drives only 4 primary partition can be created. (Use extended and logical partitions to create more partitions).
4 ----- Dhyan Tripathi You can have 4 primary partitions, or 3 primary partitions and one extended partition containing any number of logical partitions. While you can assign a drive letter to a partition, you can also map it as
primary partitions, extended partitions, and logical drives.
Typically you can only have 4 primary partitions per hard drive if you are using the MBR partition layout scheme. If you need more partitions than the maximum allowed (4), then there is a way to get many more partitions with only one hard drive.By creating an extended partition you can have as many logical partitions as you need within that extended partition, thus you can have more than only four partitions. You can have 3 primary partitions and one extended partition (for a total of 4), and inside the extended partition you can have as many logical partitions as you need.The one thing to keep in mind is that any type of Windows Operating System needs to be installed in a primary partition, otherwise you cannot boot into it. Windows XP in particular, needs to be installed in the first primary partition. For everything else, you can create as many logical partitions as you want inside the extended partition.
Assuming one of them is an extended partition on an MS-DOS partition table: Eight. If the partitions are all primary partitions: Four.
In Windows Server 2008, a physical drive using MBR partition style can have up to four primary partitions and one extended partition.
Due to limitations imposed by DOS back in the '80s, ATA (the proper name for ide) and SATA drives can only hold 4 partitions. To work around this, extended partitions were invented. Extended partitions can hold 4 more partitions, any of which can be more extended partitions. Thus the number of partitions is effectively limited by the size of the disk. These limitations aren't imposed by the disk itself, rather the PC architecture. Intel macs, which don't need to maintain compatibility with DOS or old versions of windows use EFI, which allows for 128 primary partitions.
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The Master Boot Record (MBR) scheme has a limit of 2TB for the maximum partition size. Additionally, MBR only supports up to four primary partitions or three primary partitions and one extended partition with multiple logical partitions within it. Modern systems often opt for the newer GUID Partition Table (GPT) scheme, which does not have these limitations.