Example -8.4 4096 bytes. Sectors are 512 bytes long. All metadata pointers are 32-bits long. An inode has 12 direct Consider a UNIX filesystem with the following components: Disk blocks are block...

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Extracted text: Example -8.4 4096 bytes. Sectors are 512 bytes long. All metadata pointers are 32-bits long. An inode has 12 direct Consider a UNIX filesystem with the following components: Disk blocks are block pointers, one indirect block pointer and one double-indirect block pointer. The total inode size is 256 bytes. Both indirect and double indirect blocks take up an entire disk block. (a) How much disk space, including metadata and data blocks, is needed to store a 4 GB DVD image file? (b) Assuming that there is not a buffer cache (i.e., no filesystem structures or data are cached), starting from the inumber, how many disk accesses will be required to read only the last byte in this file? To instead overwrite it?