Hi @ADITH_MOHAN
I was afraid of that. It is almost certainly because of how your USB drive is formatted:
Storage Devices
Roon can watch multiple storage locations for files at the same time. That means you can simultaneously use any (or all) of the following storage locations:
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Devices connected directly to Nucleus by USB
If your music is stored on an external USB drive, plug it into your Nucleus now. Nucleus supports USB drives pre-formatted as EXT2/3/4, VFAT/FAT32/FAT16/exFAT, NTFS, or HFS/HFS+. Note that HFS/HFS+ (also known as “Mac OS Journaled”) is read-only, which means that Nucleus will not be able to make changes or store new music on the USB drive.
Notice that USB drives formatted as “Mac OS Journaled” can be read, but not written to.
If the drive was reformatted to EXT or FAT (which your Mac has the option of doing), you will have read/write access. Unfortunately reformatting the drive also erases all the files on the disk.
The best way to check how the drive is formatted is to unplug it from the Nucleus, plug it into your Mac and check its properties. If it is HFS/HFS+, then you need to decide what to do next. The choices are buy another drive and copy everything from the old HFS-formatted drive to an EXT-formatted drive. Then you could use the HFS-formatted drive as a backup drive.
OR, move everything on the USB drive to some temporary location, reformat the drive, and copy things back.
Probably not what you wanted to hear…