Root USB Stick Read Only Now?

[matrixmainfram]

Google Nexus 10
Android version 5.0.1
Build Number LRX22C
CWM 6.0.4.7
Rooted

I have just installed the Android 5.0.1 update AND purchased a 64Gb Sandisk USB/MicroUSB memory stick.

My Nexus 10 can mount the USB stick without any problem and I can see and use all the files on it but because I had to format the USB stick as NTFS all these files are now read only so I cannot delete any nor can I move files from my Nexus 10 to the USB stick.

Does anyone know how I can convert my new NTFS USB stick to read/write?

Thanks