Fdisk For Mac
In the Disk Utility app on your Mac, select a volume in the sidebar, click the Partition button, then click Partition. In the pie chart, click the partition you want to delete, then click the Delete button. If the Delete button is dimmed, you can’t delete the. Extremely powerful partition manager. Copy, clone partitions. Can also resize NTFS. Paragon Hard Disk Manager for Mac is a system and data management solution for Apple computers. It provides powerful backup and flexible recovery features, everything you need for perfect partitioning, and reliable data wiping algorithms. Extensive hard disk management.
All external USB disks can be formatted to work on Mac OSX, but not always straight out of the box.
In this tutorial we look at formatting disks via the GUI app called Disk Utility and its equivalent command line tool diskutil. This will work in all modern versions of Apple Mac OSX including 10.9 Mavericks, 10.8, 10.7 and 10.6.
Initially external disks may be formatted for Windows and after you connect it to your Mac it appears in the device list in the Finder, but is a read only disk meaning that you can’t write to it in its current format.
The when the disk is selected in the finder bottom left symbol with the crossed out pencil means that the disk can only be read not written to. Why this is, is because they come formatted as Windows NTFS drive which OSX can only read, so we need to reformat them so we can read and write – thats where a handy utility called Disk Utility comes to the rescue.
Disk Utility
Disk Utility is found in /Applications/Utilities/Disk Utility.app, open it and select your external disk in the list on the left.
There are 2 items (or more) for each disk, you have the actual disk and the volume of the disk, the example below has the Disk Named 2 TB WD Elements and the Volume is named Elements, this example uses the Volume which will in turn also format the Disk.
Then below you will see the Format type which will be NTFS or possibly MS-DOS (FAT), we need to reformat the volume and make the format Mac OS Extended (Journaled).
Reformatting the Disk
Still with the external disk selected in Disk Utility go to the Erase tab, select Mac OS Extended (Journaled) from the format dropdown, choose to name the disk and then click Erase.
And there you have it one read and writable disk ready for OSX.
Xterm For Mac
The Security Options option next to erase can control how the disk is erased by zeroing out all the blocks on the disk, this then make it impossible to salvage any previous data, with new disks this is not necessary.
Also the other format option Mac OS Extended (Case-sensitive, Journaled) in the dropdown would allow you have same name files or folders in the same location with a mix of case like ‘red’ and ‘RED’, this is popular in the Linux disk format and also possible on OSX but not the default on OSX shipped disks.
Doing it on the line
You can also do this using the command line using the tool diskutil which is the command line interface to Disk Utility, launch Terminal, Applications/Utilities/Terminal – to see a list of your disks:
and the results are similar to:
Xterm For Mac Os X
This gives us a lot of information including the disk identifiers, size of disk and partitioning scheme. So in this example we will reformat the actual disk, disk2 using the command:
Here the command diskutil eraseDisk does the erasing, format is expressed as JHFS+ which is the Mac OS Extended (Journaled) and disk is named BackupMaster and the actual target disk is defined by its identifier disk2. The Terminal will result in this output:
Mac Disk Utility For Windows
And there you have it one formatted disk ready to go.
It started because disk drive random eject, detail on this thread:
http://discussions.apple.com/message.jspa?messageID=13106931#13106931
Now one of my partition didn't mount. I try to fix this using disk utility -repair disk function- and disk warrior, both not succeed. Then I want to try repair it using Ubuntu live cd, but before that, some tutorial that I found in someone blog says I must disable journaling. It success at other 2 partition but the one that I need to repair wasn't return any dialog after about 2 minutes, that made me close Terminal. Disk1s2 is the problem.
My assumption after some googling, my partition table is messed up and need repairing. I found enlightenment when found tesdisk http://www.cgsecurity.org/wiki/TestDisk . Summaries from what I read there, I should able repair it after run test disk to analyze then using pdisk function in terminal to restore or fix the partition.
What is this mean CHS and LBA didn't match? I assume this value is needed to be repaired.
From the explanation on that site, 'use pdisk to recreate the Mac partition map using the values given by TestDisk.' Then I realized my partition scheme isn't Apple Partition Map. Refer to image screenshoot #1 it written Fdisk partitonscheme or better known as MBR. Pdisk only support APM, and so far tutorial I found only write about pdisk:
http://perrohunter.com/read/30/repair-a-mac-os-x-hfs-partition-table
CMIIW but fdisk -e, edit function probably able to insert this new values on MBR. I just don't know how to do this.
So is there anyone in that able for *helping me to understand how I could edit this value using fdisk -e?* Please don't refer me to http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/ man8/fdisk.8.html . I've read that and still confused.
If possible using step by step explanation, similar with perrohunter pdisk. I'm not really expert with CLI.
Re-format the disk is not solution.
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As for now my external drive condition is:
1. Random eject still occur.
2. One partition didn't mount.
3. Diskutil failed to disable journaling. Thus make worrying if fdisk also unable to do the job. But at least I want to give a try.
4. Slow write/read speed even on detected partition.
iMac 7,1 2.0 GHz, Mac OS X (10.6.6)
Disk Repair Utility For Mac
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