Wednesday, April 18, 2012

All about HDD and SSD

 SOLID STATE DRIVE (SSD) 
A solid-state drive, sometimes called a solid-state disk or electronic disk, is a data storage device that uses integrated circuit assemblies as memory to store data persistently. SSD technology uses electronic interfaces compatible with traditional block I/O hard disk drives. SSDs do not employ any moving mechanical components, which distinguishes them from traditional magnetic disks such as hard disk drives (HDDs) or floppy disk, which are electromechanical devices containing spinning disks and movable read/write heads. Compared to electromechanical disks, SSDs are typically less susceptible to physical shock, are silent, have lower access time and latency, but are more expensive per unit of storage. 

HARD DISK DRIVES (HDD) 
A hard disk drive (HDD; also hard drive, hard disk, or disk drive) is a device for storing and retrieving digital information, primarily computer data. It consists of one or more rigid (hence "hard") rapidly rotating discs (often referred to as platters), coated with magnetic material and with magnetic heads arranged to write data to the surfaces and read it from them. Hard drives are classified as non-volatile, random access, digital, magnetic, data storage devices. 

Comparison of SSD with HDD 

(1)Storage capacity
  • In 2011 SSDs were available in sizes up to 2TB, but less costly 64 to 256GB drives were more common.
  • In 2011 HDDs of up to 4TB were available. 


(2)Read/write performance symmetry
  • Less expensive SSDs typically have write speeds significantly lower than their read speeds. Higher performing SSDs have similar read and write speeds.
  • HDDs generally have slightly lower write speeds than their read speeds. 


(3)Weight and size
  • Solid state drives, essentially semiconductor memory devices mounted on a circuit board, are small and light in weight.
  • HDDs are relatively large and heavy, 3.5" drives more so than 2.5" and 1.8". 


(4)Noise (acoustic)
  • SSDs have no moving parts and therefore are silent.
  • HDDs have moving parts (heads, actuator, and spindle motor) and make some sound; noise levels vary between models, but can be significant. 


(5)Random access time
  • SSDs are about 0.1 ms - many times faster than HDDs because data is accessed directly from the flash memory
  • HDD ranges from 5–10 ms due to the need to move the heads and wait for the data to rotate under the read/write head 


(6)Data transfer rate
  • SSD technology can deliver rather consistent read/write speed, typically ranging from about 100MB/s to 500MB/s, depending on the model. When SSDs access individual smaller blocks, performance is reduced. In general, the speeds are continuously improving. 
  • Once the head is positioned, when reading or writing a continuous track, a HDD can transfer data at about 100MB/s. Data transfer rate depends upon rotational speed, which can range from 4,200 to 15,000 rpm. 


(7)Temperature control
  • SSDs do not usually require any special cooling and can tolerate higher temperatures than HDDs.
  • According to Seagate, ambient temperatures above 95°F (35°C) can shorten the life of a hard disk, and reliability will be compromised at drive temperatures above 55°C or 131°F. Fan cooling may be required if temperatures would otherwise exceed these values.



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Sunday, April 8, 2012

How to format USB Drive & Memory Stick with NTFS?

If you have ever tried to format a USB thumb drive or memory stick, you may have noticed that the only options you get are FAT and FAT32 file systems. This is the default behavior in Windows XP. However, with some slight tweaking of settings, you can actually format your removable storage devices in NTFS format, including external hard drives, etc.

Of course, there is a reason why Windows defaults the formatting of removable storage to FAT and FAT32. There are actually a few advantages and disadvantages to formatting a USB drive in NTFS format, so we’ll go through those before actually talking about how to do it.

The advantages of enabling NTFS of removable storage devices are mostly security related. For example, an NTFS file system lets you to add allow and deny permissions on individual files and folders for specific Windows users, something you cannot do in the FAT file system. But that’s not all in terms of security. You can also encrypt files using Windows XP’s built-in encryption.

Other benefits include the ability to compress files and therefore save space on your USB drive. You can also set disk quotas and even create partitions! Formatting USB drives in NTFS has several advantages that would be good if you need to use some of these advanced features, i.e. for your IT department or if you’re just paranoid!

However, there are also a few drawbacks to using NFTS on a USB drive. Firstly, there is a lot more writing to the drive that is required when using NTFS and therefore your access to the device will be slower. Will it make a major difference that would prevent people from using it? Probably not, but it’s something to consider. Also, versions of Windows older than 2000 cannot read NTFS file systems, nor can most Linux systems.

The other major downside is that if you encrypt your files on the USB drive, you will not be able to open them anywhere else. Actually, this can be considered a downside or an upside depending on what you want to do. If you want to secure your USB stick so that only your user account on your one computer can open the files, then encrypting is perfect. If not, then do not encrypt the files.

How to format USB drive with NTFS?

First, connect your USB device to your computer. Then right-click on My Computer from the desktop and choose Manage.

Next click on Device Manager and then expand out Disk Drives. You should see your USB drive listed there as “Generic USB 2.0 USB Drive” or something similar.


Now right-click on the USB drive under Disk Drives and choose Properties. Then go to the Policies tab.


Now you will see two options, the “Optimize for quick removal” selected by default. Go ahead and change that by selecting the Optimize for performance option. This enables writing caching on the drive and therefore allows you to format it as NTFS! Sweet.


That’s it.

Now click OK and then go to My Computer. Right click on the drive in My Computer and choose Format. In the File System drop down you will now see the option for NTFS!

You can now secure your USB flash drive or external USB hard drive in any way you like! Enjoy!


Source: google.com

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Friday, April 6, 2012

Resumup.com : A website to create infographic of your resume

Recently, i have come across to an interesting website called ResumUp which is very creative that produces resumes designed like an infographic. ResumUp is a website that allows users to create an infographic styled resume from data taken from your LinkedIn or Facebook profile. 


Visit the website Resumup.com and allow it to use your Linked In or Facebook profile information. Within seconds it creates an infographic styled graphical presentation of your timeline as far as work experience is concerned. You can also edit various elements on the presentation and customize it further. Users can then download your Resume infographic in a PDF format or also share it online with friends on Twitter, Facebook and LinkedIn. 

Source: resumup.com

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