Steam says that my external hard drive is read-only and can't add steam library to it. HOW DO I FIX THIS?

[DingoAteMeMum]

so since i only have 2 120gb ssd's on my pc i bought an external hard drive and whenever i use it it works fine but whenever i try to add a steam library to the drive it says it's read-only,

I already tried disk part and it said that the drive is not read only and is capable of reading and writing so i dont understand why this happens, plz help me

[ReBoot]

First and foremost, can you create files there at all?

[DingoAteMeMum]

yes it can, i have destiny 2 and some other files on it

[ReBoot]

What file system does it have?

[Donna Pinciotti]

Have you tried creating a file on it very recently, as in today. Incase something has happen that changed its read write ability recently.

[DingoAteMeMum]

i downloaded AVG free antivirus like 5 days ago and it's file system is NTFS