I'm looking to create a NAS with a 3TB drive that I already have. I thought using a router and DD-WRT would do the job, but DD-WRT on my router (Asus RT-N13U) does not support GPT and thus only supports 2TB drives.

So, how do I figure out if a router supports drives greater than 2TB so I could connect the drive I already have?

Running DD-WRT on it is not a must.

Edit: Thusfar I have gathered the following regarding router support:

  • If using a router, it must support both GPT and filesystems, as well as USB.
  • DD-WRT's latest builds do have GPT support compiled into the kernel
  • Tomato GPT support?
  • Some Tomato firmwares require special builds to support USB
  • Filesystem support can be added in via kernel modules located on the drive itself, after system boot
  • No routers with only 4Mb of flash seem to have GPT, USB, and FS support, while 8+mb routers usually do

Another approach I have been looking into is running archlinux on a sharing device such as the pogoplug, thereby offloading FS duties and delegating the router to solely wireless duties.


The issue is not the hardware, but the software. DD-WRT is compiled without GPT support. If you want to enable GPT support you'd have to compile DD-WRT from source and change the correct compile flags for the linux kernel. It's a good way to get really frustated (best case) or brick your router (worst case). I'd recommend against it unless you have experience in compiling the linux kernel and building a DD-WRT firmware from source.

So you should buy a dedicated NAS.

  • I'm not going to buy a dedicated NAS because I am hell bent on doing this as cheaply as possible. I looked into compiling DD-WRT and while I have compiled a kernel or two, apparently DD-WRT is pretty near impossible to compile. I have discovered that DD-WRT is in fact compiled with GPT support now; not sure when that was added. – Ethereal Jan 9 '13 at 2:59

You don't have to use a partition table at all, you can simply format the whole drive without any partition table and then you don't need GPT support.

  • I have never considered this. Is a drive usable without a partition table? In any case, I may need (or want) several partitions but this is an interesting solution nonetheless. – Ethereal Jan 9 '13 at 2:56
  • floppies have no MBR and I think some flash disks have neither, but I don't think standard windows tools can format a HD without creating a MBR. – dtech Jan 9 '13 at 10:08

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.