One of the best ways of wiping a hard drive clean and eliminating any computer virus problem affecting it, is to format it. Brand new external hard drives need to be formatted, to be able to write or read any data on it. If you are a recent migrant to Mac computers, chances are, that you are not familiar with the procedure.
The drive should say unallocated; Note: If it does not you will need to right-click and delete the volume first. If the external hard drive is pre formatted for Mac, Disk Management will list 3 partitions and you will not be able to delete the 'Health (EFI System Partition)' because it's a protected partition.
When you have switched over from Windows, Mac OS X takes some time to get used to. With several gigabytes of data generated every day in the form of pictures, work files, movies, and music, the limited hard drive space on your MacBook or Macintosh computer is never enough. Buying a 1 TB or 500 GB hard drive is not a luxury, but a necessity. Hard Drive Formatting When you buy an external hard drive, it is in raw condition. To be able to use it, it may need to be partitioned and installed with a file access system. This file system creates a registry of addresses with physical memory sectors on the hard drive, which is used when writing and retrieving data later. The drive needs to be partitioned into volumes for ease of usage, if a user feels the need to divide it into different logical subunits.
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Procedure Formatting drives on Mac is handled by a single program, specifically designed for this purpose. It is called 'Disk Utility'. Some of the functions of this program include mounting and unmounting disks, creation of disk images, partitioning drives, and of course formatting or 'erasing' a drive, as it is referred to in Mac lingo. A recently added feature of this program, since Mac OS X Snow Leopard, is the facility to resize any of existing partitions. Let me now explain the procedure of using Disk Utility. Best speech recognition for mac 2015.
Open the utility program and you will see a list of all the existing hard drive partitions and removable data storage media, connected with your Mac. Using a USB cable, attach the external hard drive with your Mac. You will immediately see it listed on the left hand side. To format the whole drive, first select it. From among the many tabs you see in the program, click on the one which says 'Erase'. Once you select the option, you will be asked to choose the kind of file formatting system that you intend to use on the drive. The default and also the recommended choice is 'Mac OS X Journal', which is specifically designed for Mac systems.
Select the file system and then give the 'Erase' command, by clicking on the appropriate button. The formatting will begin immediately and should be done in a few minutes.
Carrying out this entire procedure is simple, because the 'Disk Utility' program has an intuitive interface. It has been created for the non-specialist user. All you really have to do is make a choice of the correct file system and the program does the rest.
Once formatted, your external hard drive is ready for use on your Mac. With the proper file system installed, accessing your stored data and copying any data from your Mac hard drive is made possible.