How using a SD card as extra storage device with auto mount at reboot on Beagle Bone Black


I am beginner using Arnströmg and need some help. I have to charge a software with Videos and need high capacity (4G) for this, for these reason, need more storage, the problem is that after format the SD and to create the logical partitions ext3, all is Ok and i can to mount and work perfectly, however when I reboot the device don´t runs and I must extract the card and turn on the Beagle Bone Black, then I can to introduce the card and work good. But this will be a server and not ever there is somebody for extract and put the card. The question is: Is posible configuring a card for mount in the start, using Arnströmg? How it doing?