http://en.wikipedia.org/wiki/Secure_Dig ... d_securityCitiraj:
On the left side there may be a write-protection notch. If the notch is omitted, the card can be read and written. If the card is notched, it is read-only. If the card has a notch and a sliding tab which coves the notch, the user can slide the tab upward (toward the contacts) to declare the card read/write, or downward to declare it read-only.
The presence of a notch, and the presence and position of a tab, have no effect on the SD card's operation. A host device that supports write protection should refuse to write to an SD card that is designated read-only in this way. Some host devices do not support write protection, which is an optional feature of the SD specification. Drivers and devices that do obey a read-only indication may give the user a way to override it.
Dakle, samo zatvori prorez i to je to, kao na kasetama i disketama...
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