can you update memory on ipad

The storage space on the iPad can not be upgraded.

The term "memory" usually refers to RAM (Random Access Memory). I assume your are referring to storage space. Neither can be upgraded on an iPad.

However, there are some wireless external hard drives that can be used with the iPad.

The Kingston Wi-Drive, which costs $50 for the 16 Gigabyte, and then $30 more for every 16 gigs more. It works by you turning it on and then accessing the files on it from an app that you download on your iDevice. You can access music, movies, and other stuff. No connections or anything, it works like a WiFi connection, you connect to it from the setting on the iPad under wireless networks.

Then there is the Seagate GoFlex, which some would recommend over the Wi-Drive. But this one costs $199 and had 500 Gigabytes of storage. It works the sameway as the Kingston: no wires, runs over its wireless connection. You can actually fit up to 300 HD movies on it.

Another option:

Expand your iPad's storage capacity with HyperDrive

http://www.macworld.com/article/1153935/hyperdrive.html

On the road with a camera, an iPad, and a Hyperdrive

http://www.macworld.com/article/1160231/ipadhyperdrive.html

 Cheers, Tom 😉

Airstash

Compatibility

Wireless operation:

Web browser WiFi b/g capable device

Optimized experience for iPhone, iPod touch, and iPad via HTML5

No internet connection required

USB operation:

Compatible with most operating systems that support USB Mass Storage Class (thumb drives)

Firmware update via file drag and drop

http://www.airstash.com/

You can also store photos and videos on SD cards. An SD card can be connected to the iPad via the camera connection kit. More detailed information on this and the wireless products already mentioned can be found at http://www.ipadstoragesolutions.com/

The Camera Kit is a one way device. The iPad can read photos and videos from media connected to the kit, but the iPad cannot write data to the Camera Kit.

The camera kit that you link to is not a standard Apple Product. Apple do not sell these for £5....

True and that is the big advantage of the wireless products, in that you can import and export data from them. But they do cost a lot more than SD cards.

As to non-apple products for iPads, I think you'll find there are plenty out there that work just fine.