Hello, Running Tomato Firmware v1.28.8752 ND USB vpn3.6 on Linksys WRTSL54GS. Recebtly I have tried using it as a NAS drive. Attached USB harddisk which was automounted in the USB and NAS options. The mapped a share name to the location in the internal file system where the drive is mounted. I have tried sharing it with and without authentication. The work group name is same as all other devices on my home network. Tomato is also assigned as the Master Browser and WINS server. Which filesystems does tomato support for both reading and writing. (NTFS/FAT32/Ext3/Ext4). ? I am asking since I am facing problems when trying to write to the shares on the Linksys router. The current hard disk attached is in Ext3/4 format and i can easily access its contents for reading from the PC and also from the Network Media Player. I mapped this router share as a mapped drive letter in Windows 7 32-Bit , and when now I am trying to copy contents to over the network it I get the error message as follows : I am unable to understand why it happens since there is a lot of space left on the drive (around 500GB). Did not try it with other file systems (NTFS/FAT32). What could be the reason for this behaviour, the OS or the Samba permissions or settings. Tried googling around for this error, but did not get much of a clue. Any help is appreciated. ======================================= Question Recalled: Found Solution Tried with a USB flash disk formatted in various file systems. Tomato can write to FAT32/NTFS/Ext2/3/4 . The disk in question I was trying to write to was earlier mounted on an external NAS drive WD MyBook World Edition and may carry effective owner and permissions to write to it. Have to straighten out the permissions to make it writeable when connected to Tomato as a NAS.