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1. MAC COMMAND LINE DISK UTILITY HOW TO
2. MAC COMMAND LINE DISK UTILITY MAC OS X
3. MAC COMMAND LINE DISK UTILITY PLUS
4. MAC COMMAND LINE DISK UTILITY FREE

Note: do not mess with the GUID_partiton_scheme or the EFI partition doing so (unless you know exactly what you are doing) will likely result in a very sad system administrator. The resultant command would end up being:ĭiskutil createRAID mirror ServerRAID JHFS+ disk2 disk3 The name of the RAID will be ServerRAID and the file system will be Journaled HFS +. To use this in an example, we will build a mirror of disk2 and disk3 from our above list. So simply list then as disk2, disk3 or whichever disks you are looking to add to the RAID.

Each disk was identified in the #: column from the list command previously run. The final aspect of the command that will build your RAID is the disks that will be included in the RAID set. Most administrators are going to choose “JHFS+”, which is an available shortened version of Journaled HFS+.

MAC COMMAND LINE DISK UTILITY MAC OS X

Available file systems in Mac OS X Server include “Journaled HFS+”, “HFS+”, Case-sensitive HFS+”, Case-sensitive Journaled HFS+”, HFS”, MS-DOS FAT16″, “MS-DOS FAT32″, MS-DOS FAT12”, “MS-DOS”, “UDF”, “UFS” and “ZFS”. Next you will include the file system type to put the RAID on. Following the RAID type you will provide a name for your RAID by using the setName verb followed by the name of the disk. Available raid types from the command line include mirror, stripe and concat which result in RAID 1, RAID 0 and JBOD respectively. When you run diskutil list you will see a listing of all partitions on your disk as can be seen below:ģ: Apple_HFS LeopardServer 15.0 Gi disk0s3Īs you will likely want to create a RAID for the boot volume of your server you will likely use the createRAID verb followed by a flag indicating the type of RAID to create. Here I'll show you how you can erase and format a disk using the command line. To do that, the only thing you need is a bit of precise syntax to make sure that you are erasing the proper disk. But some Mac users might need to erase them from the command line on Mac OS. As with the Disk Utility application, double (nay, triple) check your drives to make sure that either they are backed up or you absolutely positively do not need any of the data they contain, or you will not ever likely see your data again (my precious). Most users use Disk Utility to erase a disk or hard drive. On the far right, you’ll see an IDENTIFIER column that column contains the identifier that diskutil needs.Now that you are looking at a command prompt on the target server use the diskutil command to prepare the hard drives for installation. Just use diskutil list to see a list of all drives and partitions.

MAC COMMAND LINE DISK UTILITY FREE

Consider using APFS encryption (FileVault).īut how do you figure out what to list for device, which is the disk (or partition) that has the free space you’re trying to securely erase? diskutil can provide that information, too. Strongly-encrypted data can be instantly "erased" by destroying (or losing) the key (password), because this renders your data irretrievable in practical terms. The modern solution for quickly and securely erasing your data is encryption. Modern devices have wear-leveling, block-sparing, and possibly-persistent cache hardware, which cannot be completely erased by these commands. NOTE: This kind of secure erase is no longer considered safe.

MAC COMMAND LINE DISK UTILITY PLUS

O 4 - Three-pass erase, consisting of two random fills plus a final zero fill.

O 2 - Seven-pass erase, consisting of zero fills and all-ones fills plus a final random fill. Ownership of the affected disk is required. If you need to erase all contents of a partition but not its hosting whole-disk, use the zeroDisk or randomDisk verbs. Erasing freespace on a volume will leave your files intact, indeed, from an end-user perspective, it will appear unchanged, with the exception that it will have attempted to make it impossible to recover deleted files. Secure erasing makes it harder to recover data using "file recovery" software.Įrasing a whole-disk will leave it useless until it is partitioned again.

MAC COMMAND LINE DISK UTILITY HOW TO

Within the man pages, you’ll find the explanation for how to securely erase a disk’s free space using diskutil: secureErase level deviceĮrase, using a "secure" (but see the NOTE below) method, either a whole-disk (including all of its partitions if partitioned), or, only the free space (not in use for files) on a currently-mounted volume.

To find out about diskutil in detail, type man diskutil at the Terminal prompt. Proceed with caution, and make sure your backups are current before you try any of the following.) The feature allowed you to overwrite the free space on a drive to prevent. (Please note that, as with many Terminal commands, there’s a chance of Really Bad Things happening if you make a mistake with the following instructions. The Secure Erase Free Space feature in Disk Utility on your Mac added a layer of privacy and security to file deletion. What if you want to do this from Terminal instead? In Terminal, a program named diskutil provides most of the features of macOS’s Disk Utility.