The allocation methods define how the files are stored in the disk blocks.
There are three main disk space or file allocation methods:
1.Contiguous Allocation-in this scheme,each file occupies a set of blocks on the disk. For example if a file requires x blocks and is given a block y as the starting location,then the blocks assigned to the file be :x,y+1,y+2,......y+x-1.
This means that given the starting block address and the length of the file(in terms of blocks required) we can determine the blocks occupied by the file.
Advantages
-both the sequential and direct accesses are supported
-this is extremely fast since the number of seeks are minimal because of contiguous allocation of file blocks.
2.linked allocation-in this scheme,each file linked list of disk blocks which need not be contiguous disk blocks can be scattered anywhere on the disk.
Advantages
it is very flexible in terms of file size.file size can be increased easily since the system does not have to look for a contiguous chunk
of memory.
this method does not suffer from external fragmentation and it makes it relatively better in terms of memory utilization.
3.Indexed Allocation-in this scheme,a special block known as the index block contains the pointers to all the blocks occupied by a file.Each file has its own index block.the entry in the index block contains the disk address of the block
Advantages
it supports direct access to the blocks occupied by the file and therefore provides fast access to the file blocks
it overcomes the problem of external fragmentation.
Answer:
Open and click rates
Explanation:
Open and click rates are measuring units of how well your campaigns perform.
The work value Ramona feels strongest about is being able to help kids in the after school program.
Answer:
True
Explanation:
Cell reference or cell address is defined as a union of a column letter and a row number that recognize a cell on a worksheet.
Answer:
1. Wattage
Explanation:
Based on the information provided within the question it can be said that in this scenario you need to tell him to check to make sure it has the correct amount of wattage that he needs for his components. The wattage is the amount of power that the power supply can hold in order to power all the components within the computer.
