Method 

Description 

begin 

Initializes the SD or Flash module. 

exists 

Tests the given file exists or not. 

mkdir 

Creates a folder. It can create multiple sub folders at once; for example, LSD.mkdir("a/b/c") can create 3 folders a ,b, c, at the same time. 

open 

Opens a file (or folder). The following happens when the file path does not exist: - If FILE_WRITE mode is provided, an empty file is created; - If FILE_READ mode is provided, it returns Failed.

• FILE_READ: It can read from the beginning of file. It cannot write.
• FILE_WRITE: It can read and write, starting from the end of file in order to append the written data.

 

remove 

Deletes a file. 

rmdir 

Deletes a folder. The folder must be empty, or the function will fail.