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- Experiment 17 Directories I. Objective After performing this activity, you should be able to 1. Perform operations on directories in assembly language. II. Introduction This experiment covers a number of extended DOS services for disk operations introduced by DOS 2.0 and 3.0. Many of these services are much simpler than the original DOS services are generally recommended. These operations involve the use of an ASCIIZ string to initially identify a drive, path and filename; a file handle; and special error return codes. Int21H Service 39H: Creating a directory Function 39H creates a subdirectory, just like the DOS command MD For example, diname, dh 'C:\TASM',0 mov ah, 39h lea dx dirname int 21h A successful operation creates the subdirectory TASM in drive C. An error sets the carry flag and returns code 03 (path not found or invalid path) or 05 (access denied or directory already exists) in register AX. INTIH Service 3AH: Removing a directory Function 3AH deletes a subdirectory. just…File system implementation: a. Given a filename in a directory’s data block, how does OS locate the data block of a file? b. Compare between direct pointers and indirect pointers in referencing data blocks. c. Given a 6GB file, identify the number of index level needed when using indirect pointer.(True/False): All file systems except NTFS require the use of at least one cluster to store a file.
- You are implementing a simple file system for an operating system for managing files and folders; similar to Windows or UNIX. Your design should follow the following guidelines i) The entire file system is represented by an object which is the reference to the root folder ii) Any folder in the file system may contain two types of items, folders (subfolder) and files and you want to treat both in the same way iii) possible operations: getName, getPermission, listItem What is the most appropriate design pattern? Draw the class diagram, and make it clear what are the main components and what are their roles, and show the relationship between classes? write code of the main components in your design? Note : this is a design Pattern Question Use java To solve this question please I need a fast good answer.Thanks a lot in advance.You are implementing a simple file system for an operating system for managing files and folders; similar to Windows or UNIX. Your design should follow the following guidelines i) The entire file system is represented by an object which is the reference to the root folder ii) Any folder in the file system may contain two types of items, folders (subfolder) and files and you want to treat both in the same way iii) possible operations: getName, getPermission, listItem (1 point) What is the most appropriate design pattern?5. Assume a file system is using combined indexing scheme to keep track of the blocks allocated to a file, as in Linux/Unix file system. In the inode of a file, there are 12 direct pointers, one single-indirect pointer, one double-indirect pointer, and one triple-indirect pointer. Assume the size of a disk block address (i.e., disk pointer size) is 8 bytes. Assume block size is 4 KB. a) What is the maximum file size? b) How many index blocks are required for files of size 30 KB, 256KB, 15 MB, 512 MB, 32 GB? c) Assume nothing is cached (no disk caching applied in the system) and we know the disk location of the inode of a file of size 1 GB. How many disk accesses are required to access a byte at offset 2^14 (16K) in the file? How many disk accesses are required to access a byte at offset 2^26 in the file?
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- *C programming (Systems Programmming) Make your own shell. The functionality for this part includes: A cd built-in command Running commands with command-line arguments.Shell script 5: (Check.sh) Check Script (Check.sh) will search for all files with permission 777, display them on the screen, and then change them to 700. All work must be saved in a log file (perm_change.log).(True/False): The FAT32 file system allows the setting of individual user permissions for directories,but not files