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You can use NoteBurner YouTube Video Downloader, a handy tool that helps you save youtube videos in MP4 or MKV format. After the video has been saved in MP4/MKV format, you can transfer it to your memory card.
teach me how to download
Download it to your computer and then save into the memory card
A video card or video adapter translates binary data into images.
just Graphic memory (GDDR)
Not usually. Video card memory generally consists of ROM chips soldered directly to the card, so if the graphics card goes bad, it's best to replace it.
A video card is hardware, and as such cannot be downloaded because it is a physical thing. Perhaps you meant to ask about video card drivers, which certainly are available for download.
moose!
no you can't
Memory card adapters are designed to be used with a personal computer, so that they can, indeed, download pictures to your PC.
This will depend on the resolution of your video, and the format of the video. On average, about 4 hours of 720p HD video can be held on an 8GB memory card.
No, you can't.