I've recently bought the Numark iDJ2, and it works pretty well, I use it to mix in my favorite restaurant, and I only have to bring my iDJ2 and my ipod, instead of a ton of cds.

But I must admit that using this product was at first a little bit disappointing. AAC support were very poor, and the timecode was lagging during playback. Checking the numark website told me that a firmware update (v 1.09a) was available, with many good stuff on it.

There were a little problem: I'm a mac user.

And a simple update, that was supposed to last five minutes, became a nightmare, for this single reason.

It's a little bit weird for a product supposed to handle Apple technologies such as HFS file-system (wich is managed without any problem on a regular use) be unable to understand this same file-system when trying to update the iDJ2.

And it's very annoying, when after a couple of hours, you plug your specially-bought USB key to have a death screen that informs you there is not valid update on it.

So after having suffered a few hours, I've decided to help you saving your time and keep your karma at a good level.
You want to update your iDJ2 with your mac ? GOOD NEWS ! It's possible, and here is the rules:

1) You download the update.

2) You need an USB key, no update can be done with an iPod or an external drive (I've tried with my iPod, with an external HD, and an external DVD drive, I love learning things ;-)

3) You must format your USB key with FAT32 file-system and only this one. You can do that with the Disk Utility wich is in the Utility folder of your Applications folder in Mac OS X. If you can't use Disk Utility you will need to do it throught the command line (Google will tell you how to do).

4) copy the update file (iDJ2_v1_09a.upg) on the USB key, and to be sure that the Finder will not create hidden files that the iDJ2 would take, by mistake, to be the update, we will use the terminal to do that.
open the Terminal, and assuming that the update file is on your desktop, and that your USB key is labelled as "HELLO", type the following command:
cp ~/Desktop/iDJ2_v1_09a.upg /Volumes/HELLO/DJ2_v1_09a.upg

don't open a finder window pointing your USB key, the Finder could take this occasion to create ugly hidden files on it.

5) You can verify that your USB key is holding one, and only one file, with this command:
ls -al /Volumes/HELLO
If it's not the case, you should use rm /Volumes/HELLO/[the name of a file you want to delete] to fix it

6) Start the Update process by following the Numark instructions, as an honest PC user would do.

7) Play AAC music and be amazed by the beauty of the non-lagging timecode.