3 ms·
Unfortunately because of the way the SD card - computer interface works, storing everything twice on the same card doesn't actually get you much more reliabilit
by londons_explore 2y ago
Unfortunately because of the way the SD card - computer interface works, storing everything twice on the same card doesn't actually get you much more reliability.
The card is unaware of which bits of data are duplicates, and therefore can easily end up storing both copies of some data on areas of the physical flash that are weak - and this is even more likely considering they will probably be written around the same timestamp.
- kragen 2y agoi've heard some cards do duplicate data detection? that way they can avoid storing multiple copies of the same data, so for example copying a large file is fast
- londons_explore 2y agoPossible, but I haven't heard the same. Sometimes copying a large file feels fast because the OS has a huge cache, and it'll just take a long time in the background later when you unmount the disk.
- kragen 2y agothat is definitely a thing that happens