How many disk accesses are needed to bring byte i of a file into memory when the file is stored u...
- How many disk accesses are needed to bring byte i of a file into memory when the file is stored using contiguous allocation? Assume only the file’s FCB is in memory , block pointers require 32 bits , and that blocks hold 4096 bytes each.
- 3 accesses
- 1 + [ i/4096] accesses
- [i/4096 accesses
- 2 accesses
- 1 access
Homework Answers
Since the allocation used is contiguous method, all the blocks are stored contiguously. Hence a particular byte is accessed in 1 disk access.
Add Answer to:
How many disk accesses are needed to bring byte i of a file into memory when the file is stored u...
How many disk accesses are needed to bring byte i of a file into memory when...
How many disk accesses are needed to bring byte i of a file into memory when the file is stored using contiguous allocation? Assume only the file’s FCB is in memory , block pointers require 32 bits , and that blocks hold 4096 bytes each. 3 accesses 1 + [ i/4096] accesses [i/4096 accesses 2 accesses 1 access
How many disk accesses are needed to bring byte 4090 of a file into memory when the file is stored using double indirect indexed allocation? Assume that only the file's FCB is in memory, block po...
How many disk accesses are needed to bring byte 4090 of a file into memory when the file is stored using double indirect indexed allocation? Assume that only the file's FCB is in memory, block pointers require 32 bits, and that blocks hold 1024 bytes each.
How many disk accesses are needed to bring byte 4090 of a file into memory when the file is stored using double indirect indexed allocation? Assume that only the file's FCB is in memory,...
Suppose that a file requires 20 blocks to be stored in disk. For each of the...
Suppose that a file requires 20 blocks to be stored in disk. For each of the following allocation strategies( contiguous, linked, indexed), determine the number of disk block we need to read to bring in block 7 into memory after reading the file’s directory header?
Consider a file system on a disk that has both logical and physical block sizes of...
Consider a file system on a disk that has both logical and physical block sizes of 512 bytes. Assume that the information about each file is already in memory. For each of the three allocation strategies (contiguous, linked, and indexed), answer these questions: If we are currently at logical block 5 (the last block accessed was blocked 4) and want to access logical block 15, how many physical blocks must be read from the disk?
Consider an empty 1 Gbyte disk with the block size of 4096 bytes. When the disk...
Consider an empty 1 Gbyte disk with the block size of 4096
bytes. When the disk is formatted blocks 0 is occupied for
system-related information. The system always allocated free blocks
starting st the lowest numbered block, and it uses non-contiguous
allocation.
Question 6 (2, 4) Consider an empty 1 Gbyte disk with the block size of 4096 bytes. When the disk is formatted blocks 0 is occupied for system-related information. The system always allocates free blocks starting at the...
Really don't know what its about... Course in operating system, file system Question 2. File Systems (10 marks) (a) Consider a 32GB hard disk and a FAT file system with 24 bits cluster (block) ad...
Really don't know what its about...
Course in operating system, file system
Question 2. File Systems (10 marks) (a) Consider a 32GB hard disk and a FAT file system with 24 bits cluster (block) address. What is the minimum block (cluster) size in order to fully utilize all space in the hard disk? (3 marks) (b) Consider an index-based file system with the inode containing 64 direct pointers, 1 indirect pointer, and 1 double-indirect pointer. Suppose the size of a...
Consider a disk with block size = 4096 bytes. A block pointer is 6 bytes and...
Consider a disk with block size = 4096 bytes. A block pointer is 6 bytes and a record pointer is 8 bytes long. A file has 100,000 records of fixed length. Each record has the following fields and byte size: Name (30), Ssn (9), Dept (9), Address (40), Phone (10), Bdate (8), Sex (1), Job (4) and Salary (4). An additional byte is used as a deletion marked. a. Calculate the record size R in bytes b. Calculate the blocking...
A UNIX-type file-system uses a disk block size of 1KB, 128 byte inodes, and 32 bit...
A UNIX-type file-system uses a disk block size of 1KB, 128 byte inodes, and 32 bit disk addresses. If the inode contains 64 bytes of data, 8 direct, 1 indirect, 1 double-indirect, and 1 triple- indirect blocks, apart from other file information. How many disk blocks would be required for storing files of sizes (a) 1 byte (b) 1024 bytes (c) 64 KB (d) 1MB ?
We know that there are different disk allocation methods that help the operating system decide how...
We know that there are different disk allocation methods that help the operating system decide how disk blocks are allocated for files. In the contiguous disk allocation method, each file occupies a set of consecutive addresses on the disk. While this makes file allocation easier, an increase in the file size means that it has to be assigned elsewhere on the disk. The linked disk allocation method requires including a pointer in the current file, which points to the location...
1 Mark Question Two Consider a file system on a disk that has both logical and...
1 Mark Question Two Consider a file system on a disk that has both logical and physical block sizes of 512 tebytes. Assume that the information about each file is already in memory. For each of the three allocation strategies (contiguous, linked, and indexed), answer these at questions: a. How is the logical-to-physical address mapping accomplished in this system? (For the indexed allocation, assume that a file is always less than 512 blocks long.) b. If we are currently at...
How many disk accesses are needed to bring byte 4090 of a file into memory when the file is stored using double indirect indexed allocation? Assume that only the file's FCB is in memory, block pointers require 32 bits, and that blocks hold 1024 bytes each.
How many disk accesses are needed to bring byte 4090 of a file into memory when the file is stored using double indirect indexed allocation? Assume that only the file's FCB is in memory,...
Consider an empty 1 Gbyte disk with the block size of 4096
bytes. When the disk is formatted blocks 0 is occupied for
system-related information. The system always allocated free blocks
starting st the lowest numbered block, and it uses non-contiguous
allocation.
Question 6 (2, 4) Consider an empty 1 Gbyte disk with the block size of 4096 bytes. When the disk is formatted blocks 0 is occupied for system-related information. The system always allocates free blocks starting at the...
Really don't know what its about...
Course in operating system, file system
Question 2. File Systems (10 marks) (a) Consider a 32GB hard disk and a FAT file system with 24 bits cluster (block) address. What is the minimum block (cluster) size in order to fully utilize all space in the hard disk? (3 marks) (b) Consider an index-based file system with the inode containing 64 direct pointers, 1 indirect pointer, and 1 double-indirect pointer. Suppose the size of a...
1 Mark Question Two Consider a file system on a disk that has both logical and physical block sizes of 512 tebytes. Assume that the information about each file is already in memory. For each of the three allocation strategies (contiguous, linked, and indexed), answer these at questions: a. How is the logical-to-physical address mapping accomplished in this system? (For the indexed allocation, assume that a file is always less than 512 blocks long.) b. If we are currently at...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago