If we represent physical addresses for the Megatron 747
disk
by allocating a separate byte or bytes to each of the cylinder,
track within
a cylinder, and block within a track, how many bytes do we need?
Make a
reasonable assumption about the maximum number of blocks on each
track;
recall that the Megatron 747 has a variable number of
sectors/track.
Please explain your solutions
there are 4 cylinder providing 8 surfaces. Each surface has 2^13 or 8192 tracks. Each track has 256 sectors and each sector has 512 byte. The capacity of Megatron 747 is the product of 8 surface, times 8192 tracks, times 256 sectors, times 512 byte, Which is equals to 2^33 byte . Thus megatron 747 has 8 gigabyte. A single track hold 256* 512 byte = 128k byte.
If we represent physical addresses for the Megatron 747 disk by allocating a separate byte or...
Given a Ext3 filesystem that uses: - 32 bit addresses, - 512 byte blocks on disk, - 16 direct addresses and - up to a level 3 indirection Answer the following questions: 1) How many blocks does a 12KiB file need? 2) What is the largest file size (in KiB) that does not need indirect block references? 3) What is the largest file size (in KiB) possible using only single indirection? 4) A file that is 1104 bytes in size,...
Consider a file system that uses inodes to represent files. To locate the physical blocks of each file, its inode contains up to 12 direct disk blocks, as well as one single, one double, and one triple indirect disk blocks. a. If disk blocks are 1 KB in size, and a pointer to a disk block requires 4 bytes. What is the maximum size of a file that can be stored in this file system? Note the size of a...
With respect to zoned bit recording: a zone near the platter center has fewer sectors per track than a outermost O tracks within a particular zone have the same number of sectors. an outermost zone has fewer sectors per track than zones near the platter center O outermost zone is zone 0, where low performance applications should reside. QUESTION 28 Logical block addressing simplifies addressing by using the OS to recognize each HDD geometry. Ousing logical blocks mapped to physical...
Question 12 Consider a magnetic disk drive with 10 double sided platters, 512(=2^9) tracks per surface, and 1024 (=2^10) sectors per track. Sector size is 2KBytes (=2^10 Bytes ). Assume the average seek time 0.02 ms, the seek time from a track to its adjacent track can be ignored. The drive rotates at 5400 rpm. Successive tracks in a cylinder can be read without head movement. Furthermore, disks can be handled independently, so multiple tracks in a cylinder can be...
Problem 1. Consider a disk with block size B=1024 bytes. A block pointer is P = 8 bytes long, and a record pointer is R =7 bytes long. A file has r=5,000,000 EMPLOYEE records of fixed- length. Each record has the following fields: NAME (30 bytes), SSN (9 bytes), DEPARTMENTCODE (9 bytes), ADDRESS (35 bytes), PHONE (9 bytes), BIRTHDATE (8 bytes), SEX (1 byte), JOBCODE (4 bytes), SALARY (4 bytes, real number). An additional byte is used as a deletion...
For this assignment you will explore subnet addresses, host addresses and direct broadcast addresses. You will be provided an IP addresses and then asked to answer questions related to the IP. In this assignment, first we explain how to find the subnet address for each subnet, the range of host addresses, and the direct broadcast address. Then you will be asked to do a similar exercise by yourself. Assume that you have been assigned the 192.168.1.0/24 network. You need to...
1 Overview The goal of this assignment is to help you understand caches better. You are required to write a cache simulator using the C programming language. The programs have to run on iLab machines. We are providing real program memory traces as input to your cache simulator. The format and structure of the memory traces are described below. We will not give you improperly formatted files. You can assume all your input files will be in proper format as...
ChangeRequest(CRID, CRType, CRTitle, CROriginDate, CRPriority, CRNeedEvent, CRStatus) NeedByEvent(Event) CRPrevState(CRID, CRState, StartDate, EndDate) CRAssigned(CRID, EmpID, StartDate, EndDate) Employees(EmpID, FirstName, LastName, JobTitle) ChangeRequest(CRID, CRType, CRTitle, CROriginDate, CRPriority, CRNeedEvent, CRStatus) The CRID is the primary key, it is unique, and it is an positive integer The CRType may be one of two values: "Deficiency" or "Enhancement" CRTitle is a variable length string that may be up to 2048 characters CROriginDate is a date CRPriority is an integer that may assume a value of...
The goal of this homework is to write a small database system for an Animal Shelter. This is a no-kill shelter like the one just west of the Addition Airport. You will accept animal “donations” to the shelter, but mostly only dogs and cats. (But yes, there may be the occasional hamster or other nondog, non-cat animal donation.) At present, all we need to do is write the skeleton of a database that will track all the animals in the...
please help with no 3,4,5 and 6
Thanks
1. What is standard error? Measure of statistical accuracy of an estimate, equal to the standard deviation of the theorental distribution of a large populanon of such estimates 2. What calculation is used to describe the variation in measurements. 3. In experiment 3.2. You will be measuring out 40ml of volume. How many times will you measure 40 ml? 4. What is the difference for each time you measure out 40ml? In...