The Original R4 Adapter for DS
The original R4 adapter, produced by the self-titled "Team R4", came into existence in early 2007. The original R4 adapter looked much the same as the current R4 Card, but there was a noticable difference.
The top of the original R4 DS had a small groove to push-lock a Micro-SD card inside. This made use of a spring mechanism so that a Micro-SD card would lock into place when pushed. A simple second push would allow it to come back out of the R4 DS.
The R4 adapter in its original guise was produced for just under one year. Team R4 DS realised that the spring mechanism in the R4 adapter had problems, affecting up to 5% of the card's production. Problems with the spring could cause the mechanism to break.
This meant that Micro-SD cards would no longer go into the R4 DS properly. Obviously, this was a big problem. Therefore, Team R4 set out to create a newer version of the R4 adapter, fixing the problem and helping reliability. They called this card the "R4v2 Adapter".
R4v2 Adapter
The new version of the R4 adapter, titled the "R4v2 adapter" (predictably!), was released in late 2007. This new version removed the need for a spring mechanism to insert a Micro-SD card. Instead, it simply had a slot in the back where a user could manually slot a Micro-SD card in.
This eliminated the problems of the original R4 DS Card where the spring mechanism could go wrong
A new problem could be that the Micro-SD card accidentally becomes dislodged from the R4 adapter during play. However, we found during tests that this is fine. Unless you put a fingernail underneath the Micro-SD card and pry it out, it is hard for it to simply shake out, even on a moving train. The London Underground provided a good basis for this test!
Other Adapters similar to the R4 Adapter
Various other cards similar to the R4 adapter have been produced since the success of the original R4 DS adapter.
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