What is the maximum number of partitions allowed on a GPT disk?

The maximum number of partitions allowed on a GPT (GUID Partition Table) disk is 128. This is defined by the GPT specification, which supports a much larger number of partitions compared to the old MBR (Master Boot Record) format, which is limited to four primary partitions without using extended partitions.

The GPT structure allows for up to 128 partitions by default, but this number can be increased by changing the partition table entry size. However, most operating systems that implement GPT standardize on this 128-partition limit for compatibility and usability reasons. This capability is part of what makes GPT a more flexible and robust choice for modern computing needs, especially on larger storage devices.

Understanding this limit is important for system administrators and IT professionals when planning disk layouts for servers and personal computers, as it allows for better organization and allocation of disk space across multiple partitions.