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  • Mac OS Extended (Case-sentive, journaled)… - Apple Community.
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  • Encrypt Your USB Flash Drives, External USB Drives Or SD Cards [OS X Tips].
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In the password dialog, you can click the key icon to bring up OS X's Password Assistant, which helps you choose a strong password. Make sure and write it down or otherwise record it—if you forget it, the drive's data is irretrievable! Click Erase to finish the job. If you'd like to encrypt a drive with individual partitions, follow these steps; remember to back up any data on the drive first, as this procedure erases it completely:.

Step 1 Select the drive—named with the storage size—in Disk Utility's left-hand list.

Format Hard disk / Flash drive (journaled) - MAC

From the Partition Layout pop-up menu, choose the number of partitions; then use the options on the screen to choose the sizes of the partitions. Click Apply. Step 3 Select a partition —one of the volumes listed below the main drive in Disk Utility's volume list—you want to encrypt. Click the Erase button, provide a password for the volume, and then click Erase to encrypt the partition.

Once you've created new partitions on your external drive, you can go back and activate encryption for each. An important security note when using a partitioned drive: Once you've entered the password for a partition to mount it, that password is cached as long as any partition on the drive remains mounted. This means anyone could access an unmounted partition without needing to enter its password.

You must unmount all partitions—eject the entire disk, as it were—to ensure that OS X requires a password again for each partition. If you want to enable encryption on a drive or partition that currently contains data, and you don't want to reformat the volume s and restore that data from a backup, you'll need to use Terminal. You should, of course, still back up your data before you proceed, just in case. The command you'll be using to create or change encrypted external disks is called diskutil.

Type diskutil list and press Return to see which disks are mounted and how each is labeled by the system. The partition is changed to another format after encryption. Step 2 Locate the volume you want to encrypt, and look at the Identifier volume; you'll use that identifier—I'm going to use disk4 in my examples here—in your commands.

To add encryption, you use a CoreStorage command that can be abbreviated after diskutil as simply cs.

What to do if the Recovery HD is locked?

Be sure the volume has no files in use it must be unmounted to complete the operation , and type the following command, where PASSWORD is your desired passphrase for the encrypted volume:. Alternatively, could type -stdinpassphrase instead of -passphrase without a passphrase; this would prompt you, after pressing Return, to enter the passphrase on a separate line. I recommend a strong password with only letters and numbers—I used 1Password to generate jdeS6DG4kE8Zzfa —because the command line has difficulty with some punctuation.

This passphrase is used to unlock the disk's much stronger encryption key and thus gain access to the disk's contents. Step 3 Terminal will show primitive animation as the drive's partitions are modified and the drive is readied for remounting. On completion, you're prompted for your passphrase to mount the volume in the Finder.

You can opt to check the box to store the key in the Keychain, but you may want to decline for security's sake—that way, if both your computer and the unmounted drive are absconded with, the drive's contents remain safe even if the Mac is booted up.

What You Should Check Before Formatting an SD Card on Mac

The drive remains mounted while it's encrypted. To see the status of encryption noted as conversion enter diskutil cs list and press Return.

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Look for the indented line that begins with your disk identifier: Below a Disk: label, you'll find a line that says Size Total , with the next reading Size Converted. If you later want to remove the encryption from a volume that you encrypted using the command line, you can decrypt the drive with a corresponding command. Select the Erase tab, then confirm. This will erase the entire disk. If you want, you can select Security Options , then move the slider on that window to the first position from the left or select Zero-Out Data on Snow Leopard and earlier to physically erase the entire disk by writing over everything.

This may not work if the drive is already set up with a non-Apple Partition Map Scheme , such as is used on Windows.

Disk Utility for macOS Sierra: Partition a physical disk using Disk Utility

If that happens, just continue with item c. Select the Partition tab, then set the number of partitions from the pop-up menu below Volume Scheme use 1 partition unless you need more. Then set the Format. For your Time Machine partition, there are two considerations:. If in doubt, see the pink box below.

Set any other partitions to the desired format. If in doubt about them, see Disk Formats. When you've got everything the way you want it, click Apply and wait a few moments for the process to complete. If you get a message saying " Could not unmount disk ," some other process is using or trying to use the disk:.

How to Encrypt an External Hard Drive in Mac OS X Lion - iClarified

If you're not sure what version of OSX you're running, click here. Either way, that takes a few minutes.


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By James Pond. Time Machine - Frequently Asked Questions 5.

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