All memory cards will hold both, however access to both is device specific, so make sure that whatever you are putting the card into can use it for both music and pictures. A camera for example will not play MP3 files.
A memory stick holds files on your PSP. Such as pictures or music. However they are usually a little pricey.
Normal funtionality setting and Music, Pictures, PDF files, Video clips, Movies
Where you can send a photo or document or music along with your e-mail.
4gb ram is the way to go and 500hdd room for wahtever you enjoy etc,music,games,movies,homework
The razor cell phone needs a micro SD card to store pictures, music, and video files. The phone usually comes with one, but they can be purchased separately.
The PSP's internal memory is only to store your settings and preferences, like your connection details for the wi-fi, etc. If you want to save music, pictures or saved game files, then you must have a memory stick.
Secure Digital Cards are memory cards. Their main use is for saving pictures, music, videos, and files for portable devices. These devices include cameras, cell phones, and handheld games.
For music files, it will be .mp3 and .mp4. For videos, it will be .m4v. For pictures, it will be .jpg.
Backup data on your memory card--> Format memory card-->Everything OK now :D
Pictures, documents, music and videos are all different types of files that people save to their computers. If you want to bring your files with you when you go somewhere you have to bring some form of memory device to carry it on. Laptops where the first portable method people used for taking their files with them, then they started using memory card and now they use a cloud. A cloud allows you to save information online so you can access i from anywhere.
The fact that the memory stick is write protected will not prevent you "reading" the contents. Thus there is no problem in making the copy from the stick to the memory card.
I think the music library only recognises mp3 files, so if it is not mp3 it won't play as far as I know.