In Unix-based systems like OS X, often there are some special device drivers, such as /dev/null, or /dev/random, which instead of providing access to system devices, offer unique services. These allow programs to interact directly with the device, so for instance you can use a filesystem manager like the “diskutil” command to get information on, or fix a device.įor local storage drives, your boot drive is the first enumerated disk device, so it will be assigned the device file /dev/disk0, and you can get information on it in the Terminal by running the following “diskutil” command: diskutil info /dev/disk1
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These devices include disks, consoles, terminals, and standard input and output, among others (click for larger view).ĭevice files in OS X are a collection of drivers in the hidden “/dev” directory that are assigned to devices, allowing them to be accessed by system calls (open, read, write, close, etc.). The /dev folder has a number of different device files that are assigned to system components and peripherals, allowing programs to interact with them using system calls.
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This is especially true if you do not hear any tell-tale signs of physical failure, such as repeated click, tap, and whirr sounds coming from the drive at regular intervals.Īssuming the drive is just experiencing major low-level corruption, the problem you face now is how to format a drive that apparently cannot be formatted on your Mac? One option is to use another operating system like Windows in Boot Camp, in a Virtual Machine, or on a dedicated PC to manage the drive and attempt to repartition it however, this may not be feasible in some situations.Īnother option that should work in most cases is to use the Terminal to interact with special device files to force an overwrite of the device file representing the drive. These errors and behaviors might indicate to you that your drive is malfunctioning and you need a new one however, before you give up on a $100+ drive, ensure the problem is not simply a very low-level formatting snag that causes the drive to hang when accessed. Another possible symptom is if you get this error or one claiming the drive cannot be unmounted, when trying to format the drive or running a fix routine on it with Disk Utility. If this happens, the drive may show up in the Finder sidebar but not show data when clicked, or it may just not show up but be present in Disk Utility however, if you try to mount it you get a “resource busy” error. Even though formatting advances like Journaling in Apple’s filesystem formats help prevent data corruption, problems can still happen that result in a drive not only being unreadable, but also unable to be reformatted.
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