![]() If the Security Options button is unavailable, Disk Utility cannot perform a secure erase on the storage device. Secure erase options are available only for some types of storage devices. (Optional) If available, click Security Options, use the slider to choose how many times to write over the erased data, then click OK. If the Scheme pop-up menu isn’t available, make sure you selected the storage device you want to erase - it’s at the top of the hierarchy.Ĭlick the Format pop-up menu, then choose a file system format. Ĭlick the Scheme pop-up menu, then choose GUID Partition Map. In the sidebar, select the storage device you want to erase, then click the Erase button. But not every external hard drive is suitable for Mac systems. Or if you want a drive you can use with Mac and a Windows computer pick ExFAT. Or Mac OS Extended (Journaled) file system. This is the format you want for your external hard drive on your Mac. Underneath the name you set your drive’s file format. External hard drives are needed for many applications, such as data storage, transfer, or space expansion. Pick APFS Or Mac OS Extended File System. ![]() If you want to erase any other type of storage device: Double-click Disk Utility in the /Applications/Utilities folder. Yes, you need a Mac format external hard drive. It also doesn't require complicated ACLs and file attribution systems like NTFS.Note: If you want to get your Mac ready to trade in, sell or give away, and your computer is a Mac with Apple silicon or an Intel-based Mac with an Apple T2 Security Chip, use Erase Assistant. exFAT has no realistic file or partition size limits. exFAT is the preferred file format for flash storage drives that you share between Windows and Mac. Microsoft designed this to provide similar compatibility to FAT32 without the pesky limitations. Manufacturers like Seagate lets you read and write data interchangeably on Windows and Mac without formatting the external drive. ![]() You can only access drives formatted with HFS+ on Windows through third-party apps.Even if you’re using SSD as a Time Machine drive, it’s not compatible with APFS. However, for most people, with a fairly recent Mac, the answer is APFS. The best format for external drive Mac will be connected to is dependent on the Mac itself. Give the disk a name and choose your format. For Time Machine backups, use MacOS Extended (Journaled) if it’s a mechanical hard drive or if you’re using macOS Catalina or earlier. Go to Applications > Utilities and launch Disk Utility.To format a hard drive for Windows, open the File Explorer and click on This PC. If you have older Macs (pre–2016), particularly those too old to update to a recent version of macOS, choosing HFS+ will enable you to use your external drive with those machines. Formatting an external hard drive on Windows can be accomplished in just a few steps.If you bought a Mac between those dates, it shipped with macOS (or OS X, as it was known) installed on an HFS+ volume. Mac OS Extended, also known as HFS+ (Hierarchical File System Plus), was the primary file system used for Mac system storage from 1998 until APFS launched in 2017. Here are some of the best apps that read-write APFS on Windows. You can only access drives formatted with APFS on Windows through third-party apps. ![]() If you connect that disk to Catalina, Time Machine won’t recognize it.
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