I have a USB external HDD that I used to use with my PC for backups. I think I formatted it as either NTFS or FAT32 (can't remember). But when I plug it into my Macbook Pro, it shows up fine and I can access all the files. BUT they're all read only! I can't write anything to the drive
It reports the file system as "Windows NT filesystem". Is this the problem?
Is there a way to make it accessible to both PC & Mac?

It reports the file system as "Windows NT filesystem". Is this the problem?
Is there a way to make it accessible to both PC & Mac?