Which of the following structures is NOT stored per cylinder group in FFS?

Consider the following commands sent to a UNIX-based system (assume we start with an empty directory): Line 1: echo hello >> file1 Line 2: ln file1 file2 Line 3: cat file2 Line 4: rm file1 Line 5: cat file2 Line 6: echo more >> file1 Line 7: cat file1 Ignore any problems with whitespace or capitalization. Assume “;” shows text separated across multiple lines in the shown output.

A process calls open(“/foo/bar”) on a freshly mounted file system (nothing is cached). Counting only disk reads (not writes), how many disk reads does the file system perform to complete the open?

FSCK restores a file system to the logical state it would have had if the crash had not happened.

A hard disk spins at 7,200 RPM (8.3ms/rotation). What is the approximate worst-case rotational delay for a single read request (the time to wait for the desired sector to rotate under the head)?

Polling is always worse than using interrupts for waiting on an I/O device to complete.

The time to read a page from an SSD depends strongly on the physical page number and on the location of the previous request.

Is the following solution correct to solve the Reader/Writer problem? If yes, what is its weakness? If no, please use ONE EXAMPLE to explain why it is not correct. Note: No credit will be given if NO Example is used. rwsummer2022.jpg

Tell me one way you belive this course can improve for future hybrid students.  4 points 

In the image above, what is the clarity of number 8?