More
and more people are finding themselves using both Macs and Windows
based PCs. While compatibility is almost a non-issue now days between
Macs and PCs, as well as Macs and third party peripherals, there is one
area that may still cause confusion. In this tutorial I will explain the
“Read Only” error you may run into while using external storage
devices, and also show you how simple it is to fix.
Quick Tip: Solving “Read Only” External Drive Problems on Your Mac
The Cause of "Read Only" Disk Errors
I have a USB drive that I purchased and use with various PCs at work
and school. I am able to open the drive and can even copy files from the
drive. But if I attempt to copy a file to the drive on my Mac, I get an
icon telling me that I am not able to copy the file. If I try to delete
a file, by pressing Command+Delete, nothing happens and, if I right
click the file, the option to move it to the trash can is missing.
Something is obviously not right with the storage drive.
Trying to copy a file to my USB drive gives an icon indicating that you cannot copy files to the volume.
If you right click the drive and select Get Info,
you can see at the bottom of the info window under the sharing and
permissions twirl down, you only have permission to read from this drive
and nothing else.
Looking in the info window you can see that the permissions for the drive only allow for reading.
The cause of this is due to the filing system the storage device is
formatted in. If you look in the general twirl-down under format you can
see that this drive is formatted in the windows NT file system. The
NTFS file system is a system specifically optimized for Windows in the
way that it organizes the data on the drive. While this file system is
readable on Macs because OS X can rearrange the data as it is reading
it, the way that NTFS writes the files to the storage device is not;
hence, you can read, but not write.
The cause of the "Read Only" behavior is due to the format of the file system.
Many storage devices such as USB drives and external hard disk drives
come pre-formatted in NTFS because a larger number of consumers are
using them on PCs. However, making your storage device Mac compatible,
and even cross compatible with Macs and PCs, is as simple as
reformatting the drive.
Correcting the "Read Only" Disk Error
First and foremost before proceeding any further, you are about to
format your storage device. Be sure to copy any and all file from the
drive as all the data on the drive will be erased. This can be a simple
task or a long undertaking depending on the size and usage of the
storage device, but is a necessary and important step.
You can reformat a hard drive on Mac OS X by using Disk Utility. In
the left-hand side inside of Disk Utility you will see a list of all the
connected hard drives. Each physical drive is shown with the partitions
of that drive nested below. Highlight the physical drive you wish to
reformat and on the menu at the top to the right select erase.
You are about to format your storage device. Be sure to
copy any and all file from the drive as all the data on the drive will
be erased.
You can select the physical disc you want to reformat in the tree on the left-hand side of Disk Utility. You can select a new file system format from the drop down below, and also name the new volume to be created.
You will see two fields where you can choose a file system format and
a field to name the new partition you are going to create. If you are
just going to use your drive on Mac computers, you can select one of the
Mac OS options. If you wish to create a partition that is cross
compatible with Mac computers as well as PCs, you can select either the
MS-DOS Fils System format or the exFAT format. You can rename the hard
drive to whatever descriptive name you like then click erase and now the
drive is formatted in a cross compatible filing system. If you click on
the drive and select get info you can now see that the permissions are
set to read and write.
Showing the info of the newly formatted drive, you can see the disc is now set to read and write.
Conclusion
The NTFS file system format is a great format to use if you are using
your drive solely on Windows based PCs. But if you need to use your
drive on Mac OS, or on both PCs and Mac OS, NTFS will unfortunately not
be the best format to use. In this tutorial I’ve identified the cause of
the “read only” error that Mac users may find when using external
storage devices, and also how to easily fix the problem by reformatting
your drive to a fully Mac OS compatible format.
Unknown
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation.
Medical Disclaimer
The information on this site is not intended or implied to be a substitute for professional medical advice, diagnosis or treatment. All content, including text, graphics, images and information, contained on or available through this web site is for general information purposes only. Krobknea makes no representation and assumes no responsibility for the accuracy of information contained on or available through this web site, and such information is subject to change without notice. You are encouraged to confirm any information obtained from or through this web site with other sources, and review all information regarding any medical condition or treatment with your physician. NEVER DISREGARD PROFESSIONAL MEDICAL ADVICE OR DELAY SEEKING MEDICAL TREATMENT BECAUSE OF SOMETHING YOU HAVE READ ON OR ACCESSED THROUGH THIS WEB SITE.