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Most new disks come with various things on them that you don't need, and may even conflict with Time Machine. First, decide if you're going to put other data, or backups for multiple Macs, on the drive.
If so, see question 3 or question 4 before proceeding. Case-sensitivity on Time Machine backups.
Pick the right file system for your Mac’s internal or external storage
A case-sensitive format means upper-case letters in file names are seen as different from lower-case letters. That's the default if Time Machine formats it for you, but non-case-sensitive also known as case-ignorant is the default for all other volumes.
Do not use case-sensitive unless you're sure you need it. Click each partition in the sidebar indented under the main line of the drive , and you'll see the Format towards the lower left.
Effective with Lion If ANY disk being backed-up is case-sensitive , then your backups must be case-sensitive also. There's no choice: So if you have, or think you might add, a case-sensitive disk, make your backup disk Mac OS Extended Case-sensitive, Journaled now. Mac OX Extended Journaled.
Disk Utility for macOS Sierra: Erase a volume using Disk Utility
First released in , it offers all sorts of benefits over Mac OS Extended, the previous default. APFS Explained: For one thing, APFS is faster: There are also a number of reliability improvements, making things like corrupted files a lot less common. There are a lot of upsides here. Reverse compatibility.
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To this day, it remains the default file system for mechanical and hybrid hard drives, both while installing macOS and while formatting external drives. ExFat should basically only be used on drives that need to work with both Windows and macOS computers. The format dates back to , and was made by Microsoft to provide some of the cross-platform compatibility of the older FAT32 format without the file and partition size limitations.
But formatting a drive with ExFAT offers one huge advantage: Sure, you could read a Mac formatted drive on Windows or read a Windows formatted drive on a Mac , but both solutions either cost money or are unstable. However, this isn't your only choice. Depending on the partition scheme, these are the file systems Mac OS I've lost a lot of data because the FAT file system on a FireWire drive got corrupt after I accidentally turned off the drive while it was in use.
After this, newer files started overwriting older ones, but I didn't find out until a month later.
Pick the right file system for your Mac’s internal or external storage | Ars Technica
And don't format or partition an iPod using Disk Utility, because the iPod gets confused, even though it will function as an external drive. In addition to the file systems listed above that you can use to format your drives with, Mac OS X has various levels of support for the following file systems:. And you may want to start reading up on ZFS, Sun's revolutionary new file system that is supposed to come to the Mac with Leopard. You must login or create an account to comment. Skip to main content When you put a new hard drive in your Mac—or connect an external one using FireWire or USB—you need to decide how to partition the drive and what file system to put on it.
There are three choices: Apple Partition Map: