This volume needs to be repaired, so if you see errors listed in red when clicking "Verify Disk," then be sure to correct them as they can result in the disk only mounting as read-only.įormatting errors can also cause a drive to be read-only. Note that these permissions settings will only be available on drives with formats that support them, so if you are using a FAT32-formatted drive, the option to ignore permissions will not be available. Once this is complete, detach and reattach your external drive, and then try toggling the setting to ignore ownership on the volume. In here, locate the file called "volinfo.database" and remove it from this folder (you may need to authenticate to do this). To do this, choose "Go to Folder" from the Finder's Go menu, and then type in "/var/db" and press Enter to open the hidden system database folder. If this setting is enabled and you still do not have access, you can try removing the system's volume information database, which holds this setting for external drives on the system. Then check the box to "ignore ownership on this volume," or toggle it off and then on if it's already enabled. In the information window that pops up, go to the Sharing section and click the lock to authenticate. To set this option for external drives, select the drive on your desktop or in the Finder sidebar, and then press Command-I to get information on the drive. To prevent such errors from happening, OS X includes a setting to ignore permissions on external drives, so all files on the drive should be fully accessible regardless of their permissions settings. #EXTERNAL HARD DRIVE FILE PERMISSIONS MAC FULL#This may happen even though getting information on files and folders shows you ought to have full access to the drive. Since permissions are set up through account UUID and UID numbers, if the drive is used with different systems, it may have permissions associated with it for accounts that your current system does not recognize, or even odd permissions settings that can prevent access to the files on the disk or to the disk itself. #EXTERNAL HARD DRIVE FILE PERMISSIONS MAC MAC OS X#To get around this, you can simply use Disk Utility to repartition and format the drive to Mac OS X Extended, provided the drive is only going to be used with a Mac, or format it to ExFAT or FAT, both of which are fully supported in OS X.īeing a multiuser operating system, OS X sets up access permissions for all files and folders on the system, including external drives, which are merely accessed as a folder once attached and mounted. To check if a drive is NTFS-formatted, open Disk Utility and select it from the sidebar, and you should see its format listed among other details at the bottom of the Disk Utility window. The drive's formatting can be seen in the information window as well as in Disk Utility, and clicking the check box at the bottom of the window will ensure the drive's permissions are ignored. #EXTERNAL HARD DRIVE FILE PERMISSIONS MAC DRIVERS#Unfortunately even though there are third-party drivers and workarounds to allow OS X to write to NTFS drives, these features are not supported by default, so such drives will only be mounted read-only. #EXTERNAL HARD DRIVE FILE PERMISSIONS MAC WINDOWS#Often commercially available drives will be formatted to FAT32 and therefore be fully compatible with both Windows and OS X however, many popular drives (especially high-capacity ones) may be formatted to NTFS by default. The first detail to check is if the drive is formatted to the popular NTFS format used in Windows systems. Changing the permissions for parent folder access does not necessarily mean each file contained therein will have the permissions changed to that of the parent folder.Do you have an external hard drive that you cannot write to on your Mac? While most external storage media's default formatting and other setups should make them both readable and writable on most Mac systems, there may be times when this is not the case. Consequently, if you see a user listed that should not have read or write access, you may choose remove that user by highlighting the user name, then click the - (minus) sign below the user column.Ĭoncurrently, it should be stated that that above procedure may need to be repeated for each individual file that resides within the folder. If you do not see a two-column list of user Names and Privileges, left click the tiny arrow next to "Sharing & Permissions."Ĥ) Ensure that the appropriate user has both READ & WRITE permissions in the right-side column next to the corresponding user name.ĥ) Should the appropriate user name not be listed in the left column, you'll need to add the user by clicking the + (plus) button below the user column. You'll see a subsection labeled "Sharing & Permissions."ģ) The subsections are nested like an accordion style. 1) Right click the file/folder, choose Get InfoĢ) Look at the bottom of the window that opened containing the file info.
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