dection 5Storage Devices.docx

Gpt vs mbr 052 342 so how does gpt compare with mbr

Info icon This preview shows pages 25–26. Sign up to view the full content.

View Full Document Right Arrow Icon
GPT vs MBR 0:52-3:42 So, how does GPT compare with MBR partitions? Let's look at both of their characteristics. GUIDs are used to identify partition types. This provides a way to independently identify and reference partitions and disks. A GPT disk can be basic or dynamic, just like an MBR disk can be basic or dynamic. GPT disks also support up to 128 partitions depending on space allocated for the partition table,instead of the four primary partitions limited to MBR. There is no need for extended and logical partitions. A GPT disk can support between 8 and 9.4 zettabytes, depending on the sector size. An MBR partition table is limited to 2.2 terabytes. GPT keeps a backup of the partition table at the end of the disk that aids in recovery in case the primary ones are damaged. On an MBR disk, the partitioning and boot data is stored in one place. If this data is overwritten or corrupted, you're in trouble, but a GPT disk stores multiple copies of this data across the disk, so it's much more robust and can recover if the data's corrupted. GPT also stores cyclic redundancy check, or CRC values, to check that its data is intact. If the data is corrupted, GPT notices the problem and attempts to recover the damaged data from another location on the disk. MBR has no way of knowing if the data's corrupted. You would only see that there was a problem when the boot process failed or the partitions vanished. GPT drives also include a protective MBR. This protective MBR sees the GPT drive as a single partition that extends across the entire drive. So, if you try to manage a GPT disk with an old tool that can only read MBR's, it'll see the GPT disk as a single partition that extends across the entire drive. The protective MBR makes sure that the old tools don't mistake the GPT drive for a non-partitioned drive and overwrite all your data. You'll probably want to use GPT when setting up a drive, but if you need compatibility with old systems, like the ability to boot Windows off a drive on a computer with a traditional BIOS, you'll need to use MBR. Windows can only boot from GPT on UEFI-based computers running 64-bit versions of Windows 7, 8.X, 10, and the corresponding server versions. All versions of Windows 7 and later can read GPT drives and use them for data, they just can't boot from them without UEFI. Because Windows 7 doesn't support UEFI on 32-bit platforms, you can't boot from a GPT partition on Windows 7. Other operating systems can also use GPT. Linux has built-in support for GPT. Apple's Intel Macs no longer use Apple's APT scheme, or Apple Partition Table scheme, but uses GPT instead. Summary 3:43-3:59 So, let's review some important things about GPT partitioning. GPT is a new standard that's gradually replacing MBR. With GPT, you can have basic and dynamic disks and 128 partitions that hold more space. GPT also aids in the recovery of your primary partitions if they become corrupted.
Image of page 25

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 26
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern