Default partition scheme on intel-based mac computers

Contents

  1. Apple Partition Map - Wikipedia
  2. Frequently asked questions about the GUID Partitioning Table disk architecture
  3. The Problem

However, all Intel-based Macs can also access this type of partitioning. Consequently, this is the default partition scheme you will find on most new preformatted storage drives. This partition scheme is also commonly used by peripherals that store to flash drives such as digital cameras or smart phones.

Apple Partition Map - Wikipedia

Obviously, if you have any additional drives formatted with APM or MBR, you will have to repartition those drives in order for them to be bootable on an Intel-based Mac. Also, you should keep MBR drives unmodified if you intend to keep those drives backward-compatible with generic PCs or peripherals. The volume format defines how the files and folders are saved to the drive.

To maintain compatibility with other operating systems and provide advanced features for newer Mac systems, Mac OS X supports a variety of storage volume formats. Normally Mac OS Extended is case-preserving but case-insensitive. By adding support for case sensitivity, Apple resolved this issue. The journal records what file operations creation, expansion, deletion, and so on are in progress at any given moment. This avoids both the possibility of volume corruption and the need to run a lengthy check-and-repair process on the volume after a crash.

While journaling protects the file structure, it cannot protect the contents of files themselves against corruption. Starting with Mac OS X v A wide variety of file systems are out there. See All Related Store Items. All rights reserved. Publishers of technology books, eBooks, and videos for creative people. White Oct 29, You will learn how to properly manage and troubleshoot these storage assets and to manage storage security through ownership, permissions, and access control lists ACLs. This chapter is from the book.

Time Goals This chapter takes approximately 2 hours to complete. Recognize the various file systems supported by Mac OS X Manage and troubleshoot file systems using a variety of tools Understand and manage file ownership and permissions. NOTE While journaling protects the file structure, it cannot protect the contents of files themselves against corruption.

Frequently asked questions about the GUID Partitioning Table disk architecture

More Info A wide variety of file systems are out there. Related Resources Store Articles Blogs. Disks with hybrid MBRs don't use extended partitions, though, because maintaining consistency between the GPT and MBR sides of the disk -- already a challenging enough task with regular hybrid MBRs -- would become much tougher.

It is not strictly a UEFI 2. So in effect hybrid MBR is limited to 3 partitions.

The Problem

But most tools don't let you do this. The only one I know that does is gdisk. I agree that hybrid MBR is standards-violating and is a bastardization. In particular it's annoying as balls that brand new machines sold today still are based on Intel EFI 1. It's not because of GPT. It's because of MBR. If you aren't using MBR at all, which could be happening, everything should work fine. I found this article which explains the partitioning scheme.


  • Apple Partition Types on the Hard Drive.
  • Apple Partition Map;
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  • Mac OS X Support Essentials: File Systems.
  • Disk Utility for macOS Sierra: Partition a physical disk using Disk Utility!
  • EFI-Booting Ubuntu on a Mac.
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Some legacy operating systems cannot see them. Linux can see the extended partitions after the kernel is loaded.

I presume you're able to boot properly because the Linux partition is on one of the four "primary" partitions. This trickery is what is called Hybrid MBR - it's a dangerous and ugly hack like cmurphy says.

How To Create Disk Partition in Mac OS Sierra and Other OS X

It's not even a hack and will even work on Windows bit. Just create the system drive on the floppy, and use bcdboot to put your boot files on the floppy. Add a bootsector with bootsect. Boot from floppy. Steps are detailed here. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Intel Mac can't have more than 4 partitions?

Ask Question. Asked 9 years, 1 month ago. Active 5 years, 6 months ago. Viewed 6k times.


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  8. Rod Smith Rod Smith 4 4 silver badges 3 3 bronze badges. If you are using MBR, then I have no idea what's happening.