My passport for mac on pc. The instructions below are for Windows 10, but other versions of Windows from Windows 7 and up can also format an external drive as exFAT for use with Mac as well. UEFI/GPT-based hard drive partitions • • 7 minutes to read In this article Create custom partition layouts for your hard disk drives (HDDs), solid-state drives (SSDs), and other drives when deploying Windows to Unified Extensible Firmware Interface (UEFI)–based devices. Note If you use a custom partition layout on Windows 10 for desktop editions (Home, Pro, Enterprise, and Education), update the push-button recovery script so the recovery tools can recreate the custom partition layout when needed. In this topic: • • • Drive Partition Rules When you deploy Windows to a UEFI-based device, you must format the hard drive that includes the Windows partition by using a GUID partition table (GPT) file system. Additional drives may use either the GPT or the master boot record (MBR) file format. A GPT drive may have up to 128 partitions. ![]() Each partition can have a maximum of 18 exabytes (~18.8 million terabytes) of space. Windows partition requirements: • System partition The device must contain a system partition. On GPT drives, this is known as the EFI System Partition, or the ESP. This partition is usually stored on the primary hard drive. The device boots to this partition. The minimum size of this partition is 100 MB, and must be formatted using the FAT32 file format. This partition is managed by the operating system, and should not contain any other files, including Windows RE tools. Note For Advanced Format 4K Native drives (4-KB-per-sector) drives, the minimum size is 260 MB, due to a limitation of the FAT32 file format. The minimum partition size of FAT32 drives is calculated as sector size (4KB) x 65527 = 256 MB. Advanced Format 512e drives are not affected by this limitation, because their emulated sector size is 512 bytes. 512 bytes x 65527 = 32 MB, which is less than the 100 MB minimum size for this partition. • Microsoft® reserved partition (MSR) Beginning in Windows 10, the size of the MSR is 16 MB. Add an MSR to each GPT drive to help with partition management. The MSR is a reserved partition that does not receive a partition ID. It cannot store user data. • Other utility partitions Any other utility partitions not managed by Windows must be located before the Windows, data, and recovery image partitions. This allows end users to perform actions such as resizing the Windows partition without affecting system utilities. Protect end users from accidentally modifying utility partitions by identifying them using a GPT attribute. This prevents these partitions from appearing in File Explorer. To set partitions as utility partitions • When you are deploying Windows by using the DiskPart tool, use the attributes volume set GPT_ATTRIBUTE_PLATFORM_REQUIRED command after you create the partition to identify the partition as a utility partition. For more information, see the MSDN topic:. To verify that system and utility partitions exist • Click Start, right-click This PC, and then click Manage. The Computer Management window opens. • Click Disk Management. The list of available drives and partitions appears. • In the list of drives and partitions, confirm that the system and utility partitions are present and are not assigned a drive letter. • Windows partition • The partition must have at least 20 gigabytes (GB) of drive space for 64-bit versions, or 16 GB for 32-bit versions. • The Windows partition must be formatted using the NTFS file format. • The Windows partition must have 16 GB of free space after the user has completed the Out Of Box Experience (OOBE) and Automatic Maintenance has completed. • Recovery tools partition This partition must be at least 300 MB. The Windows Recovery Environment (Windows RE) tools require additional free space: • If the partition is less than 500 MB, it must have at least 50 MB of free space. • If the partition is 500 MB or larger, it must have at least 320 MB of free space. • If the partition is larger than 1 GB, we recommend that it should have at least 1 GB free. When calculating free space, note: • The recovery image, winre.wim, is typically between 250-300MB, depending on what drivers, languages, and customizations you add. • The file system itself can take up additional space. For example, NTFS may reserve 5-15MB or more on a 750MB partition. This partition must use the Type ID: DE94BBA4-06D1-4D40-A16A-BFD50179D6AC. The recovery tools should be in a separate partition than the Windows partition to support automatic failover and to support booting partitions encrypted with Windows BitLocker Drive Encryption. We recommend that you place this partition immediately after the Windows partition.
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