What that shows is that if that device had been judged under SD Card Speed Class criteria, the internal storage would've been put up as a lower class storage than the external storage.
![speed reader for android speed reader for android](https://3.bp.blogspot.com/-f6mDfwmVFtY/WNClbn5I1iI/AAAAAAAADB4/YGA_yjqwMxsy0Ysr1xdpWW4oxgnf59_XwCLcB/s1600/Need%2Bfor%2BSpeed%2BMost%2BWanted%2BPS2%2BISO%2B1.jpg)
What he found is that the internal storage is very fast at read speeds, close to an Ultra High Speed 3 Class card at 33MB/s read, but only manage a paltry 5 MB/s write speed while his external SD Card are more balanced, at 11 MB/s read but 8 MB/s write. One fellow Stack Exchange measured the performance of his Galaxy S2 internal storage vs the external SD Card that he happens to have. This is usually not the case, as many people just buy a standard 2MB/s SD Card, as they're a lot cheaper and most consumers don't need the ultra high speed storages.Īnother confounding problem is the kind of workload that a storage is optimized for. With a suitable device that has a suitable high speed SD Card bus, it's possible that SD Card can be faster than the internal storage. A Class 2 SD Card has a minimum read/write speed of just a paltry 2MB/s, while an Ultra High Speed card can perform at 30MB/s. While they're all flash technology, there's a very wide certain in the speed of the storage. I understand that read/write speeds are dependent on what the phone is, and what the SD card is, but since both are flash memory, I thought the read/write times would pretty much be around the same. What happens to the phone that allows the jump in read/write speeds? On a thread on, I saw that rooting a phone allows one to increase the read/write speeds of a phone to an SD card. My question is, in general cases with modern phones, is reading and writing files and media (not Apps) to internal phone storage faster than to an SD card? However, looking at this article, it seems most of the phones' write speeds are slower than a Class 10 SD card's minimum write speed, and I couldn't find minimum read speeds for SD cards, so couldn't compare those, so I'm wondering why everyone's benchmark tests showed wild differences between the 2. From reading a lot of other material online, I have also learned that apps generally run better from internal storage than from SD cards, except for cases where the SD card I/O speed is better than the phones'. I also understand from this question, why it's safer to keep apps on the internal storage: internal memory Vs SD cardīut then I learned that “Flash memory speed is not tied to a maximum data transfer speed like USB standards.” source, which I guess is something I should have guessed from just knowing how the read/write speeds vary wildly across from devices.