Will using an android cellphone with external memory affect its performance?

I was told that some android applications have problems when installed on an external memory card. For example, some wont install or run when on external SD cards. Is this true?



Also, what kind of card should i get? Would a class 4 SDHC card be enough?Will using an android cellphone with external memory affect its performance?
If you're using FroYo (OS version 2.2) or later, apps should automatically install as much as they can to the SD card and leave enough 'footprint' on the phone memory to know it's there, etc. You can also move apps to the SD card through the Manage Applications menu, for the apps that support it. (This is generally necessary with Amazon Appstore purchases, for whatever reason.)



Many custom ROMs will allow you to install fully to the SD card. The impact depends on the appplication and how it's set up. It can also confuse the phone if you remove the SD card- if you have a widget or a program running that's entirely on the SD card and the SD card is removed, you don't have that widget/app until you replace the card.





The type of card depends on the phone- some phones have size limits. (For example, my old LG Ally couldn't handle cards %26gt;16gb.) Otherwise, it mostly depends on what you want to do- if you want to store music/documents/etc to the card or install a hundred apps and just let them sit there, a larger-capacity card is probably good. If you use streaming/cloud services (like Amazon Cloud/MP3, Google Music/Docs, etc.) instead, you won't have to worry as much about storage space and can get something w/ less capacity.