This is why you have to choose MBR or GPT before creating partitions on a drive. This information includes where partitions begin and end on the physical disk, so your operating system knows which sectors belong to each partition and which partition is bootable.
MBR (Master Boot Record) and GPT (GUID Partition Table) are two different ways of storing the partitioning information on a drive. You have to partition a disk drive before you can use it. If you've ever partitioned and formatted a disk-or set up a Mac to dual boot Windows-you've likely had to deal with MBR and GPT. GPT is the new standard and is gradually replacing MBR. This isn't a Windows-only standard, by the way-Mac OS X, Linux, and other operating systems can also use GPT.Ī partition structure defines how information is structured on the partition, where partitions begin and end, and also the code that is used during startup if a partition is bootable.
GPT brings with it many advantages, but MBR is still the most compatible and is still necessary in some cases.
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