Category: Literature Review on Projects

Overview of DAS, NAS and SAN

Each and every project will have the confidential data which is to be stored in their computer by using different types of storage devices. There is a necessity of assuring the security for the data stored which is more important to the organizations and companies.

The DAS-direct attached storage will store the data on the servers which is considered to be one of the significant devices for the purpose of the storage of the enterprise data. There are different types of the restrictions like preservation, the provisioning as well as the scalability within the process of storing the information on the servers. 

The main reason for having these types of limitations is because the storage is always vulnerable to the different restrictions of the DAS solutions. Now a day’s because of the significance of securing the confidential data the security of stored data is happened to be one of the biggest challenge. Because of the different types of limitations and restrictions in the DAS the new storage systems which are cost effective are being established such as NAS- the network attached storage as well as the SAN- storage area network solutions. 

There are more extra benefits by using the NAS as well as SAN such as the leveraging network administrative resources that can be utilized in order to support and manage the different types of the distributed storage devices in an efficient manner. There is a rapid decrease within the equipment costs as well as the production because of the usage of the networked storage. It is strongly specified by IDC that in the coming years nearly 70% of the companies will use the network storage devices. The NAS and SAN solutions are more vulnerable towards the network layer attacks and for this reason they are facing many challenges. 

Methodology definition

Methodology is considered as the process of giving the appropriate solution to the problems that takes place in the research process by specifying the different type of the principles and approaches.

Research Methodology types

In general the quantitative and the qualitative are the two different types of the research methodologies that are used in the methodology process.

 Quantitative research method

The articles, case studies, books, journals, reviews and the web documents are different types of the data sources that are included in the quantitative research method. It is totally a theory based approach and the specific data related to the research is been gathered based on the research requirements.

Qualitative research method

The surveys, interview reports and questionnaires are the data sources included in the qualitative research method. The participants are included in the process and are asked with some questions related to the research process and the answers specified by the respondents are considered as the major data for the research process (Trochim. 2000).

Research method used

Within this research process the quantitative research method is utilized to collect the information required to complete the research in an reliable manner and the different articles and web documents related to the similar topic are taken into consideration from the internet sources and are analyzed according to the research requirements. 

Ethical issues

This research process is carried out by following all the ethics and morals and the information gathered from the previous scholars is analyzed according to the requirements without violating it. This research process is completed in an honest way by following the entire authentication processes and I wish to provide my valuable views and ideas for the future work.

Differences between RAM and ROM

RAM and ROM are used to perform operations of computer with high speed and in user PC stored data is accessed easily. RAM is used hardware to store programs of applications, and processes are randomly accessed. On the other hand, RAM is used to perform rebooting the PC, RAM is considered as computer backbone and it is erasable completely.

 Speed

ROM speed is lower when compared to speed of RAM. Because of this reason, most PC has ROM with greater capacity. In terms, ROM is engraved software. While hard drive is presented in ROM, in chips RAM is presented. So, sufficient ROM amount is needed by computer system of user to run applications and programs in computer operating system.

 Convenience

Speed is considered as major difference which is presented between ROM and RAM because applications must be loaded with high speed via ROM to run applications and software. This memory remains when computer is shut down though updating ROM when user PC is on. User may need to buy RAM when PC of user is slow.

 Storage capacity

RAM is referred as volatile storage. When switch off the PC, all stored information is completely cleared out. For storage purpose, all computers own nonvolatile storage capacity and when switch off PC, instructions are passed. When system is in on state then ROM is updated.

If user wants to boost speed of user computer, additional memory adding is needed by him that perform rectangle cards resemble. Additional thing is, ROM is referred as unchangeable memory which runs applications and software. Because of its useful functions, without ROM the system will not perform its operations in effective manner.

Introduction to  Characteristics of an Internal Hard disk:

A hard disk is a storage device which is also called as a hard drive or a hard disk drive, in order to store the information and instructions into the hard disk, it has one or many circular platters which are inflexible and make use of the magnetic particles for the storing. Usually, longitudinal recording is used by the hard disks for storing the information, in this approach the magnetic particles are aligned horizontally.

The storage capacity of the hard disks can be increased by using the perpendicular recording for storing the information by aligning the magnetic particles vertically. The determination of the hard disk capacity can be done by considering the number of platters it has, which type of recording is used whether the perpendicular or longitudinal and the alignment of magnetic particles on the platters. 

Generally, a platter is prepared with ceramic or aluminium glass and also has a material coating on that and this coating permit the recording of the items on the surface magnetically. Each and every platter consists of two heads on either sides of that and the heads are read and write. A cylinder is a vertical section in a track by which it can be passed across all the platters and this cylinder will refer the location of the write and read heads.

The disk can be classified in to various sections and tracks and this process is called formatting. A narrow recording band which can make a complete circle on the disk’s surface is a track. The storage locations of a disk can be classified into sections which are in pie-shape, and the tracks are broken in to arcs by the sections and these small arcs are called sectors. The platters in the disk drive will revolve when the computer is on; the number of revolutions that the platters rotate is 5,400 revolutions to 15,000 revolutions per a minute.

 This will permit the access to all the sectors and tracks on the platters instantly. That means the tracks and sectors of the platters can be accessed automatically. The speed at which the transfer of information, instructions and data is done is called the transfer rate. The item on a storage medium can be located by the storage device and the time taken for locating the items is measured by the access time. The access time is also used to measure the time needed to deliver an item to the processor from the memory.