mac os x terminal syntax for external drive

Mac os x terminal syntax for external drive install#
Mac os x terminal syntax for external drive full#
Mac os x terminal syntax for external drive download#

If you modify the instructions so that you point the source at your damaged_external and the destination at the good_external, it should work just as well. Here is an article on using rsync to create a bootable clone of your boot disk.

Rsync approach - this would be a File by File copy. But if the problem is the disk drive, if the dd works, and all the file system metadata makes it over, then you might have a working file system.

Mac os x terminal syntax for external drive full#

The full path is copied at the Terminal window’s current. Then locate the file or folder in the Finder and drag it to the open Terminal window: Dragging an item from the Finder to a Terminal window. NOTE: If the file system is corrupt, that is to say, the file system metadata is 'out of whack' but the disk blocks holding that data is good, then you will just be putting the broken file system on the other external drive. The one I tend to use most is to first type the command at the command line with a trailing space. As it is copying in 256K chunks will take awhile. But trying to copy 4TB in 512-byte chunks will take forever. If you have individual damaged sectors you might lose 256K if just one 512byte sector is bad in that range. The bs=262144 is the read/write size of 256K. And you don’t have to spend a dime to do it.Block by Block copy would be the ' dd' command (man dd).ĭd if=/Volumes/ damaged_external of=/Volumes/ good_external bs=262144 conv=noerror When the process is completed, quit Terminal. Wait while Terminal erases and copies the files to the USB drive. Copy and paste the command given below into Terminal.

Mac os x terminal syntax for external drive download#

In the meantime, with this tool at your disposal you can resize partitions on-the-fly, rather than having to copy data back and forth to an external drive. Download El Capitan from Apple and quit the installer. This new command is a work in progress and will probably see changes when OS X 10.5 arrives. Unfortunately, the error messages won’t go into any detail. If you have any system or special metadata files-which can’t be moved-in the section of your partition that you wish to reallocate, the command will also fail. If it encounters any disk problems, it will stop, and you’ll need to run Disk Utility or another disk-maintenance program. You cannot resize FAT32 partitions with theĬommand occasionally fails. You now have two Mac partitions and one FAT32 partition. To split the Mac partition from the previous example in two again, for example, you could run this command:ĭiskutil resizeVolume disk2s2 65G JHFS+ Part2 65G To make sure you know which identifier to use-the partition numbers have probably changed. So if you split a 232GB partition, the above command would give you a first partition of 100GB and a second partition of 132GB. If there’s more empty space in the partition, the command will use it all. Then it creates a new, second partition, named Part2, using the journaled HFS+ format, with a minimum size of 100GB. It specifies a size of 100GB for the first partition. This command splits a single partition in two. Here’s an example of a slightly more complicatedĭiskutil resizeVolume disk2s2 100G JHFS+ Part2 100G In Terminal for more information on this command.) To make a bootable partition for Windows, you must use theĬommand, which will destroy all data on it.

Mac os x terminal syntax for external drive install#

TheĬommand will resize your disk, partition it, and format it to use MS-DOS, but it can’t install an MBR (Master Boot Record) on the disk. You cannot create a bootable partition for Boot Camp using this command. For example, to create a 100GB partition in journaled HFS+, you’d type You must specify the size for each partition.