World's Smallest 64GB Solid State Disk!

A solid-state drive (SSD) is a data storage device that uses solid-state memory to store persistent data. SSD are distinguished from traditional hard disk drives (HDDs), which are electromechanical devices containing spinning disks and movable read/write heads.

As of 2010, most SSDs use NAND-based flash memory, which retains memory even without power. SSDs is using volatile random-access memory (RAM) also exist for situations which require even faster access, but do not necessarily need data persistance after power loss, or use external power or batteries to maintain the data after power is removed.

A Hybrid Drive= HDD+SDD. In May 2010, Seagate launched the Momentus XT solid state hybrid drive. The SSD portion of new drive is also now a larger 4 GB, compared to 256 MB in th epast.


Compare to traditional HDDs, SSDs are typically less susceptible to physical shock, quiter, and have lower access time and latency. SSDs use the same interface as hard disk drives, thus easily replacing them in kosr applications.

NAND Flash uses floating-gate transistors, but they are connected in a way that resembles a NAND gate. These group are then connected via some additional transistors to a NOR-style bit line array. NAND flash uses tunnel injection for writing and tunnel release for erasing. NAND flash, memory forms the core of the removable USB storage devices known as USB flash drives, as well as most memory card formats and solid-state drives available today.


See you soon!

References:

http://www.technama.com/2010/world%E2%80%99s-smallest-64gb-solid-state-disk/

http://encyclopedia.thefreedictionary.com/Flash+memory#NAND_flash

http://encyclopedia.thefreedictionary.com/solid+state+disk

http://encyclopedia.thefreedictionary.com/Hybrid+drive

A new way to NANO- The new iPod nano with Multi-Touch

Remixed for fingertips

Ipod nano with multi-touch is designed to be easy, intuitive, and fun- just likes music. And it’s even smaller, so music can be an even bigger part of just about everything.

Music has a whole new feel.

iPod nano has been completely redesigned with Multi-Touch- the same technology that makes iPhone, iPad, and iPod touch so amazing. Now it’s half the size and even easier to play. And everything you want to hear is just a tap or swipe away.
Turn up the color.
In sleek anodized aluminium and seven bright colors, iPod makes a huge statement: you are, most definitely, ready to rock.



Pixels that pop.

Show off ypur album art. Photos, and the color-coordinated wallpaper on the 1.5-inch color display with 240-by-240 pixel resolution. It’s tiny yet stunning.




Clip on and cut loose.

The new built-in clip makes it easy to move to the music. Just clip iPod nano to ypur sleeve, jacket, or bag. And wherever you go, your favourite tunes are right where you need them.



Plug into the groove.

With the built-in 30-pin connector, you can easily plug iPod nano into your car stereo system, your speakers at home, and many other products made for iPod.





It fits your fingers.

iPod nano is 46 percent smaller, 42 percent lighter, and 100 percent made for music with Multi-Touch. It’s the perfect size for a tap or a swipe, so fingertips feel right at home.


MULTI-TOUCH BASICS




Home screen

Swipe left to see additional icons. Toreturn home from other screens, swipe right, or touch and hold anywhere. (swipe)





Multi-Touch

Tap to select items. Swipe up or down to browse lists. Rotate the screen using two fingers. Double-tap to zoom photos. (rotate)




Custom Home Screens

Touch and hold an icon until it jiggles, then drag it to a new location. Press Sleep/Wake when finished. (drag)





Song controls

Tap an album cover to show song controls. Swipe left to see Repeat, Genius, and Shuffle controls. Shake iPod nano to shuffle songs.





Genius

Tap Genius Mixes to hear songs that go great together. Or, create a Genius playlist by playing a song like, and tapping the song control.




FM radio

Tap to show radio controls. Flick the radio dial to change stations, or tap to set favourites. Swipe left to show Live Pause controls.



www.apple.com

Secondary Storage

Secondary Storage Media

 Hello Guys!

Good day friends!

 

In today's lesson, we will be looking at secondary storage media. 

 

This became necessary due to the fact that primary storage devices such as RAM and ROM are limited in size and are temporary , while secondary storage is permanent and can be used for backup purposes and future use. 

 

A comparison can be made among the variety of secondary storage devices in respect to their portability, speed and capacity.

 

1.Storage capacity

Storage capacity is the amount that a particular storage medium can hold. Large capacity storage devices are more preferred for many sophisticated programs and large database.

2.Access speed

This refers to the average time needed to locate data on a secondary storage device. Access time is measured in milliseconds.

3.Portability

 This refers to the ease and accessibility of a device to transfer information from one computer to another.

For your information, every secondary storage device requires its own drive.Besides, 

Storage devices record and retrieve data, instructions and information to and from storage media. Examples are floppy disk drive, hard disk drive, compact disc drive.

Secondary storage devices fall into two main categories:

• Direct Access Storage Devices (DASD)
• Serial/Sequential Access Storage Devices (SASD)

  Storage media comprised of many types which is

• Floppy diskettes
• Hard disks
• Magnetic tape
• USB flash drive
• CD-ROM (Compact Disc Read Only Memory)
• WORM (Write Once Read Many)
• Compact Disc Recordable (CD-R)
• Compact Disc Rewritable (CD-RW)
• Digital Versatile/Video Disc (DVD)
• Flash memory

Generally,compact Disc also known as optical disc.The Holographic Versatile Disc (HVD) is an optical disc technology developed between April 2004 and mid-2008 which can store the same amount of information of between 20 and 200  Blu-ray discs. 

 

Blu-ray Disc

A red laser is used as the reference beam to read servo-information  from a regular CD-style aluminum layer near the bottom. Servoinformation is used to monitor the position of the read head over the disc, similar to the head, track, and sector information on a conventional  hard disk drive. On a CD or DVD.

How Holographic Versatile Discs (HVD) Work?

Holography is a method of recording patterns of light to produce a three-dimensional object. The recorded patterns of light are called a hologram. 

 HVD offers several advantages over traditional storage technology. First and foremost,HVDs can ultimately store more than 1 terabyte (TB) of information  that's 200 times more than a single-sided DVD and 20 times more than a current double-sided Blu-ray. 

This is partly due to HVDs storing holograms in overlapping patterns, while a DVD basically stores bits of information side-by-side. HVDs also use a thicker recording layer than DVDs an HVD stores information in almost the entire volume of the disc, instead of just a single, thin layer.

 

Volumetric recording method

DVD vs. HVD: Recording-layer depth

 

The other major boost over conventional memory systems is HVD's transfer rate of up to 1 gigabyte (GB) per second  that's 40 times faster than DVD. 

An HVD stores and retrieves an entire page of data, approximately 60,000 bits of information, in one pulse of light, while a DVD stores and retrieves one bit of data in one pulse of light.

 

 

References ;

http://www.youthlinkjamaica.com/cxc/infotech20101019.htm 

http://www.blu-ray.com/info/

http://electronics.howstuffworks.com/hvd.htm 

 

 Credit to;

Ecma International