0,The R4 does not have an internal memory instead it runs on Micro-SD cards,so the R4's GB maximum is the maximum of the Micro-SD,I read somewhere the biggest Micro-SD you can use it 32gbs.
wal-mart ,target,best buy,maybe game-stop,
They are able to hold the maximum for standard SD cards, which is 2GB. SDHC cards will not work with official cards, but some clone cards have SDHC support.
you have to download thatThe R4i SDHC Card for Nintendo DS, DS Lite, DSi & DSi XL is a device that allows you to launch games, run applications and play media that you downloaded from the Internet. Place up to 32 gigabytes of files on a microSD or SDHC memory card, insert the card in the R4 slot and turn your DS or DSi on! Playing downloaded games has never been easier. The R4i SDHC is a must-have for all Nintendo DS and DS Lite console owners.You Can purchase R4i SDHC from www.r4ishop.comWhy is it better than the regular R4 DS or the R4 SDHC? Because the R4i SDHC is compatible with the Nintendo DSi and DSi XL/LL - even consoles flashed with 1.4 firmwares, unlike the original R4 DS. Note that the card contains renewed hardware and thus uses different system files
Well, that depends. Most memory cards are 4 GB (for about $10 on Dealextreme.com) and can hold about 60-80 moderate-sized games. For $16 though, (on Dealextreme.com) you can get an 8GB memory card which can hold about 180-200 DS games.(I recommend it). But in order to use those DS games, you have to buy an R4 ($8.00 from Dealextreme.com) to transform the data from your computer into a data form that can be read by the DS. (By the way, I have an R4, and they are AMAZING!) ---This answer is courtesy of--- MegaChunkeyMonkey
A r4 card is a card you can use to download games on, so you can play them eaiser!
Not natively, but you can get a flash card such as the R4 that will let you. Google R4 DS
From what I hear it is compatible. I am not compielty sure if it compatible. There are many r4 cards in the market currently. The r4 ds card is only for ds and ds lite. but the r4i card can run on dsi. Well, the latest version is r4 3ds card. It can run on Nintendo 3DS,DSi and DS console. If you want to get a flash card with good compatibility, I suggest you to got a r4 3ds card.
No.
i don't know want your taking about but if you mean R4 card i know a R4 card is a DS card that you can download games for free
An R4 is basically a mod chip for the Nintendo DS console. You can download games from the internet and put them on your R4 card and play the games on your Nintendo DS.
The cheapest i have seen was for £5.42/$9.50 (not including P&P or MicroSD Card) There are too many r4 ds card in the market currently. The cheapest r4 ds card cost about 5EUR. But it only support DS and DS lite. The famous card is r4i sdhc 3ds. It support Nintendo 3DS,DSi,DS. So, I suggest you to buy a r4i sdhc 3ds card.
You can by getting an r4 card for ds (by ordering)