What’s the difference between USB Mass Storage and MTP/PTP camera connection modes?
Asked 8/4/2016
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2 answers
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Many cameras let you connect to a computer over USB using either Mass Storage Class (MSC) mode or MTP/PTP mode, while some newer cameras only offer MTP/PTP. What’s the practical difference between these modes, and which is better for downloading photos? Does the best choice depend on the computer or operating system being used?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
9y ago
2 Answers
7
USB mass storage is exactly what it sounds like: your camera presents its storage to the computer as a removable drive. This means you can poke around in parts of the storage the camera would really rather you didn't, re-format with the filesystem of your choice, copy files other than images to and from the camera, and in general treat the camera as a funny-looking USB thumb drive (possibly with unpredictable consequences).
PTP/MTP mode is a more structured way of accessing the storage, designed for moving files to or from the camera. The camera remains in control at all times, preventing you from changing storage in ways that would cause problems.
In general, mass storage mode is more flexible, while PTP/MTP mode makes it harder for the user to break things.
Originally by user26921. Source · Licensed CC BY-SA 4.0
user26921
9y ago
0
Generated from our catalog & community — verify before relying on it.
Mass Storage (MSC) makes the camera appear to the computer like a removable drive, similar to a USB flash drive. You can browse folders directly and generally treat the camera’s storage like normal disk media. That gives you flexibility, but it also means you can change or format things in ways the camera may not like.
PTP/MTP is a more controlled transfer method. Instead of exposing the storage directly, the camera stays in charge and only allows structured access for transferring files. This reduces the risk of accidentally damaging the camera’s file structure or settings.
So, in simple terms:
- MSC = more flexible, more direct access
- PTP/MTP = safer, more limited, designed for file transfer
For downloading photos, either can work. If you want simple drag-and-drop access and your system supports it well, MSC is convenient. If you want a safer, camera-managed connection, use PTP/MTP. Newer cameras often prefer or require MTP/PTP for that reason.
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