SMB mount of USB drive attached to WDTV is read-only

I have an HFS-formatted USB drive attached to my WD TV Live SMP.  From my Mac, I can mount that drive via SMB.  However, the mount is read-only.  That is, I cannot copy files to the drive over the network.

How do I fix this?  Writing to the drive remotely is a critical feature for me.

Is journaling enabled on the drive?

Per the Knowledge Base:

“The USB drive will be read only (due to Linux based permission issues) if formatted as HFS+ (Journaled). No current Linux kernel can support writing to journalled HFS+ drives.”

The problem seems to have gone away by itself.  Whenever I mount the drive, it’s read/write.  I don’t know why it wasn’t working initially, but everything’s okay now.