(2-4-6-8-10) (class) 2 class 2 6 class 8 class 10 10 . ( - - ) 10 10 30 ( up to 30 ) 30 . DSLR . 4 . . . apple 16 32 . . . HTC 16 ٣٢ 8 HTC 32 . class 10 32 64 . .