![Read Read](/uploads/1/2/6/2/126267456/832244754.jpg)
Hi
I've just updated to High Sierra and it seems that my 2 external drives - which previously worked fine, contain a LOT of data and are not used on Windows - are now formatted to NTFS Read Only. Is there a way to switch the format and permissions back without reformatting the whole drive which (a) could go wrong and lose something and (b) would be a disaster for my files which are all images written through Lightroom and will not be recognised if they are 'moved' ie deleted and copied back.
Aug 5, 2013 - 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.
![Mac external drive read only Mac external drive read only](/uploads/1/2/6/2/126267456/734508702.png)
Urgent help appreciated.
Thank you.
iMac (21.5-inch, Late 2013)
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