What are the differences among Internal storage, external storage, sd card and removable storage?

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Difference between Internal Storage, External Storage (aka primary external storage) and Secondary External Storage?

Internal Storage: is storage that is not accessible by the user, except via installed apps (or by rooting their device). Example: data/data/app_packageName

External Storage has two types:

Primary External Storage: In built shared storage which is “accessible by the user by plugging in a USB cable and mounting it as a drive on a host computer”. Example: When we say Nexus 5 32 GB.

Secondary External Storage: Removable storage. Example: SD Card.

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