Erasing partitions from flash when upgrading physical flash

This is something I hadn't come up against before, and thankfully, it's pretty easy.

If you are upgrading flash from one stick to two, you may be pulling one stick from another device. When you do this, there will likely be a partition left on it. Here's how to wipe it so the device will see the slots as contiguous flash.

(copied from here: http://www.dslreports.com/faq/8683 )

HOST1#erase flash

It will ask you which partition to erase. Erase the one WITHOUT the IOS on it, usually its number 2. Repeat that for all the partitions except the one with the IOS on it.

HOST1#conf t
HOST1(config)#no partition flash
HOST1(config)#exit
HOST1#sh version

verify the partitions are erased.

HOST1#reload

Should see your contiguous flash memory total.