It translates to a theoretical limitation of 9.4 ZB (9.4 zettabytes, or 9.4 billion terabytes). This partitioning scheme lets up to 64 bits of information be used within logical sectors. To make more bits available for addressing, the storage device must be initialized by using GPT. ![]() Therefore, a capacity beyond 2.2 TB isn't addressable by using the MBR partitioning scheme. Because the maximum number that can be represented by using 32 bits is 4,294,967,295, it translates to 2.199 TB of capacity by using 512-byte sectors (approximately 2.2 TB). The 2-TB barrier is the result of this 32-bit limitation. This scheme sets a limit of 32 for the number of bits that are available to represent the number of logical sectors. The problem in this computation is that the partitioning scheme that is used by most modern Windows-based computers is MBR (master boot record). Therefore, any storage capacity that is greater than what can be represented by using 32 bits would require an additional bit. However, a computer system requires 32 bits (1 s and 0 s) of information to represent this large number. For example, to achieve a device that has a capacity of 2 TB, you must have 3,906,250,000 512-byte sectors. To determine the capacity of the storage device, you multiply the number of logical sectors within the device by the size of each logical sector. LBA0 represents the first logical sector of the device, and the last LBA designation represents the last logical sector of the device, one label per sector. It's the arrangement of the logical sectors that constitute the media. The management of modern storage devices is addressed by using a scheme called Logical Block Addressing (LBA). Therefore, a reference to Windows 7 includes Windows Server 2008 R2, Windows Vista includes Windows Server 2008, and Windows XP includes Windows Server 2003 and Windows Server 2003 R2.
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