![]() ![]() Unlike the MBR drive, the GPT drive stores multiple copies of the boot data across several partitions, making recovery much easier. One additional major difference is in how GPT drives store boot data. On a Windows system, GPT drives can have up to 128 different partitions without using an extended partition. GPT drives can be vastly larger than their MBR counterparts (with the right settings, a theoretical 256TB drive would work). GPT drives suffer few of the limitations of an MBR drive. The GUID Partition Table assigns every partition on your drive a globally unique identifier (GUID), a 128-bit number that identifies only your hardware (a 128-bit integer has a maximum value of 1.7 x 10^39-a phenomenally large number). GPT is closely associated with UEFI, the firmware solution modernizing the old alternative, BIOS. This was fine when a 2TB drive was a substantial outlay, but you can now pick up an 8TB drive, like a Seagate Barracuda, for an affordable price. Furthermore, an MBR drive can only have four primary partitions. MBR only works with drives up to 2TB in size. The Master Boot Record takes its name from its location at the beginning of the drive, containing the bootloader for the operating system and information about the drive partitions. MBR was developed for IBM PCs and, as such, was the primary partition table choice for Windows machines stretching for quite some time. MBR is the older of the two and therefore is compatible with a wider range of systems. GPTįirst up, consider the differences between MBR and GPT and why some systems use one over the other. So, here's how to convert your MBR disk to GPT without losing a scrap of data. However, there are two tools you can use to switch from MBR to GPT without incurring data loss.
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