FAT32 will let you directly plug the drive into both windows and mac. But you are limited to an individual file size of 4GB mac OS extended will be readable only by macs but your files can be larger.there are ways to make the different file systems readable by the other type of computer, i'm referring to default OS capabilities. when sharing the drive over the network the format only matters to the computer the drive is physically plugged into.

(only mentioning because this comes up frequently in relation to this question in the forums). ​ (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 or or backups of Mac OS X system files.To Read/Write HFS+ from Windows, Install.To Read HFS+ (but not Write) from Windows, Install.

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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) (Windows NT File System). Read/Write NTFS from native Windows.

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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 (approx $20) (Best Choice for Lion and later). For 32-bit Mac OS X, install (free) (does not work in 64-bit mode). For 64-bit Snow Leopard, read this:. Some have reported problems using (approx $36).

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. (FAT64).

Supported in Mac OS X only in 10.6.5 or later. Not all Windows versions support exFAT. 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. (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.

Click to expand.I'm still on an old version of iPhoto, but I'm pretty sure the iPhoto library is still actually a folder, much like OS X (and iOS) applications. It may look like a file, but that's just some trickery in the Finder-if you right-click it and do 'Show Package Contents' (or look at the directory in Terminal), you'll see what I mean. (That being said, it's presented as such to prevent the average user from poking around inside the 'file.' It's meant to be modified by iPhoto itsef only.).

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Click to expand.Besides Time Machine (which requires directory hard-linking, a Leopard addition to HFS+), I'm not aware of any (though if you're using it for Mac backups at all, even manual ones, I'd say HFS+ is still a good idea since you're less likely to run into problems with the type or number/length of characters in file names or file sizes since different file systems have different restrictions here). If file/folder permissions are an issue, HFS+ is really the only file system supported on OS X that contains this feature. FAT variants simply don't support this at all, and NTFS does, but Apple's implementation is read-only. This probably isn't a big deal for most people, however. In short, if you're only using it on Mac, go with HFS+ (a.k.a. MacOS Extended). If you want to use it on Windows as well, consider a different format (see advantages and disadvantages another poster provided) or multiple partitions (as suggested by others, e.g., above).

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