Just did this myself for a 1 TB WD block drive that has Windows and Linux (non-macosx) data. DiskUtility is how it worked for me, after saving data from the two partitions. The key idea here is to convet the extenral drive from a MasterBootRecord (MBR) partiionmap to a GUID partion map. Online documentation for GUID ( is one) tells how GUID creates a baseline 4-part partion map to create partitions for compatibility with non-GUID-compliant systems while having the other partitions for newer OS. In short I did this: • Saved my data from the existing partitions • Used DiskUtility to partition to a 2-partion disk and selected the 'Options' below the disk map picture to make it GUID, with one as MacOS nd one as NTFS. You must adjust partition sizes for this. Time Machine will recognize the MacOSX partition, and Windows recognises the NTFS partition.

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Want off the drive prior to formatting. Physically install the drive into the Mac. Insert the Mac OS X install CD or USB drive. Power on the computer while holding. OS X and Linux can only read NTFS-formatted drives, but not write to them—unless you have a third-party driver like NTFS-3G installed. The below steps can be used to format Mac internal hard drives, external hard drives or USB flash drives. Just follow these steps to format and erase your.

Unless you want ONLY a MacOSX partition for TimeMachine and not use the evice for multi-system storage. Then you let MacOSX keep the entire disk. Descurvive enough, but you end up with a multi-OS-compatible drive. You dug up an old one, back when I was trying to impress people with my technical knowledge, but before I could apply it fully with strategy. Partitioning a hard drive is for times when you need parts of a disk to act under different OSes, now. But there was once a time when the disks were larger than OS could handle. So partitions were required to use the disks that were larger (for example chopping a 300 GB disk into 160 GB segments).

And recall that losing a disk loses all partitions. And that you should not put a critical backup on just one partition of a disk unless you have no option. Currently people partition Mac disks to run BootCamp, not just 'because'. That being said, I am glad that the technical advice somewhere in here did solve one of your problems. ExFAT is not journaled and IIRC does not have permissions. If you have processing power to use more advanced file systems, why use the dumb one?

Wrong on Exfat. Been using a couple Exfat drives for use between Mac and PC for a long time, no worries. There is no 'dumb' one, only reliability issues at fail, and compatibility issues. Ive got mountains of hard drives, most are HFS+ (mac osx ext. Jour.) Exfat speeds are perfectly fine.

You missed the intent of the post to the original poster. Speaking to the OP, the intent was to be stated: 1. Small HD for swapping files between Mac and PC (Exfat). A HFS+ (mac osx ext. Jour.) HD for use as a time machine.and 3. An archive copy of all vital data stored away.

FAT32 (File Allocation Table) • Read/Write FAT32 from both native Windows and native Mac OS X. • Maximum file size: 4GB. • Maximum volume size: 2TB • You can use this format if you share the drive between Mac OS X and Windows computers and have no files larger than 4GB. NTFS (Windows NT File System) • Read/Write NTFS from native Windows.

Generic pcl driver for mac os x. • Read only NTFS from native Mac OS X • To Read/Write/Format NTFS from Mac OS X, here are some alternatives: • For Mac OS X 10.4 or later (32 or 64-bit), install Paragon (approx $20) (Best Choice for Lion) • Native NTFS support can be enabled in Snow Leopard and Lion, but is not advisable, due to instability. • AirPort Extreme (802.11n) and Time Capsule do not support NTFS • Maximum file size: 16 TB • Maximum volume size: 256TB • You can use this format if you routinely share a drive with multiple Windows systems. HFS+ (Hierarchical File System, a.k.a. Mac OS Extended (Journaled) Don't use case-sensitive) • Read/Write HFS+ from native Mac OS X • Required for Time Machine or Carbon Copy Cloner or SuperDuper!

Backups of Mac internal hard drive. • To Read HFS+ (but not Write) from Windows, Install HFSExplorer • Maximum file size: 8EiB • Maximum volume size: 8EiB • You can use this format if you only use the drive with Mac OS X, or use it for backups of your Mac OS X internal drive, or if you only share it with one Windows PC (with MacDrive installed on the PC) EXFAT (FAT64) • Supported in Mac OS X only in 10.6.5 or later. • Not all Windows versions support exFAT. • exFAT (Extended File Allocation Table) • AirPort Extreme (802.11n) and Time Capsule do not support exFAT • Maximum file size: 16 EiB • Maximum volume size: 64 ZiB • You can use this format if it is supported by all computers with which you intend to share the drive. See 'disadvantages' for details. Apple Footer • This site contains user submitted content, comments and opinions and is for informational purposes only. Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the efficacy of any proposed solutions on the community forums.