A7-Ting Wei Chien(Willy)

There are many parameters that could be used to describe disk performance; among them are:   number of bits per track disk capacity (in bits) number of disk surfaces rotational speed rotational latency transfer rate tracks per surface sectors per track blocks per track sectors per block seek time speed of disk arm block-read time number of blocks   Some of these parameters are independent, and others are (approximately) linearly related. That is, doubling one doubles the other. Decide which of these parameters are linearly related. Then, select from the list below, the relationship that is true, to within a close approximation. Note: none of the statements may be true exactly, but one will always be much closer to the truth than the other three. Also note: you should assume all dimensions and parameters of the disk are unchanged except for the ones mentioned.        a)  If you divide tracks into half as many blocks, then you double the read time for a block.…

There are many parameters that could be used to describe disk performance; among them are: number of bits per track disk capacity (in bits) number of disk surfaces rotational speed rotational latency transfer rate tracks per surface sectors per track blocks per track sectors per block seek time speed of disk arm block-read time number of blocks   Some of these parameters are independent, and others are (approximately) linearly related. That is, doubling one doubles the other. Decide which of these parameters are linearly related. Then, select from the list below, the relationship that is true, to within a close approximation. Note: none of the statements may be true exactly, but one will always be much closer to the truth than the other three. Also note: you should assume all dimensions and parameters of the disk are unchanged except for the ones mentioned.  a)  If you double the number of sectors per block, then you double the number of blocks on the disk.  b)…

Consider a disk with the following characteristics: block size 512 bytes, number of blocks per track=20, number of tracks per surface=400. A disk pack consists of 15 double sided disks. Suppose the disk drive rotates the disk pack at an average speed of 2400 rpm (revolutions per minute) i) How much time in (msec) does one disk revolution take? ii) Using the total capacity of the track as 10240 bytes how many bytes will be transferred from the track in 1 msec (ie transfer rate in bytes/sec)

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01. Consider a disk pack with 16 surfaces, 128 tracks per surface and 256 scctors per track 312 bytes of data are stored in a bit serial manner in a sector. The capacity of the disk pack and the number of bits roquired to specify a particular sector in the disk are respectively

Q] Consider a disk with a sector size of 512 bytes, 2000 tracks per surface, 50 sectorsPer track, five double-sided platters, and average seek time of 10 msec.a) What is the capacity of a track in bytes?b) What is the capacity of each surface?c) What is the capacity of the disk?d) How many cylinders does the disk have?e) Give examples of valid block sizes. Is 256 bytes a valid block size? 2048?51200?f) If the disk platters rotate at 5400 rpm (revolutions per minute), what is theMaximum rotational delay?

Question#4: Consider a file system that uses inodes to represent files. Disk blocks are 8 KB in size, and a pointer to a disk block requires 4 bytes. This file system has 12 direct disk blocks, as well as single, double, and triple indirect disk blocks. What is the maximum size of a file that can be stored in this file system?

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On a 16 GB hard disk drive (HDD), each cluster consists of 32 sectors and each sector has a fixed size of 512 bytes. A text file with a size of 150,000 bytes is to be stored. a.  i.What is the size of the slack space, in bytes, once the file has been stored?

In the I/O system, the responsibility of the layer of device drivers is to (Chapter 5 wake driver when I/O completed set up device registers and check status O perform I/O operation make 1/O call and format I/O

Consider a file system that uses inodes to represent files. Disk blocks are 16 KB in size, and a pointer to a disk block requires 4 bytes. This file system has 12 direct disk blocks, as well as single, double, and triple indirect disk blocks. What is the maximum size of a file that can be stored in this file system? Show calculation steps

Let us assume a disk with rotational speed of 15,000 rpm, 512 bytes per sector, 400 sectors per track and 1000 tracks on the disk, average seek time is 4ms. We want to transmit   a file of size 1 MByte, which is stored contiguously on the disk. a. What is the transfer time for this file? b. What is the average access time for this file? c. What is the rotational delay in this case? d. What is the total time to read 1 sector? e. What is the total time to read 1 track for sequential organization?

Calculate how much disk space (in whole sectors and tracks) will be required to store 1GB (230 bytes) of data if a disk is single-zoned with 512 bytes/sector and 1024 sectors/track. Ignore any file header record(s) and track indices.

Consider a disk with following specifications: 20 surface, 1000 tracks/surface, 16 sectors/track, data density 1 KB/sector, rotation speed 3000 rpm. The operating system initiates the transfer between the disk and the memory sector-wise. Once the head has been placed on the right track, the disk reads a sector in a single scan. It reads bits from the sector while the head is passing over the sector. The read bits are formed into bytes in a serial-in-parallel-out buffer and each byte is then transferred to memory. The disk writing is exactly a complementary process. For parts (c) and (d) below, assume memory read-write time = 0.1 microsecond/ byte, interrupt driven transfer has an interrupt overhead = 0.4 microseconds, the DMA initialization and termination overhead is negligible compared to the total sector transfer time. DMA requests are always granted. (a) What is the total capacity of the disk? (b) What is the data transfer rate? (c) What is the percentage of time the CPU is…

Subject: Computer Organization and ArchitectureTopics Covered: IA-32 Architecture SEE ATTACHED PHOTO FOR THE PROBLEM

3. A hard disk has 64 sectors/ track, 16 platters, each with 2 regarding surface and 2000 cylinders. The address of a sector is given as corresponds to sector number is

Question A file system with 300 GByte disk uses a file descriptor with 8 direct block addresses, I indirect block address and 1 doubly indirect block address. The size of each disk block is 128 Bytes and the size of each disk block address is 8 Bytes. The maximum possible file size in this file system will be ?

(a) Let us assume a disk with rotational speed of 15,000 rpm, 512 bytes per sector, 400 sectors per track and 1000 tracks on the disk, average seek time is 4ms. We want to transmit a file of size I MByte, which is stored contiguously on the disk. Determine the following: (i) What is the transfer time for this file? (ii) What is the average access time for this file? ) What is the rotational delay in this case? bt A magnetic disk with 5 platters has 2048 tracks/platter, 1024 sectors/track (fixed number of sectors per track), and 512-byte sectors. Determine its total capacity.

a) What is the maximum file size that can be supported in this file system? Please answer with the following format: _KB +_ MB +_ GB + _ TB. b) Consider when the file system uses 1M (1M = 220) blocks to store inodes and uses 512M blocks to store normal file data. Given a set of image file (each size 5600B), what is the maximum number of such image files that the file system can store? c) Consider one file F1 with size 6KB, file F2 with size 40KB. Does the file system take the same amount of time to obtain the index of the last block of F1 and F2 and why?