Storage


Toshiba has announced three models for its range of ultra high capacity USB 2.0 External hard drives at 100GB,120GB,160GB and 200 GB in the price range of $130 – $230 .
The 200GB drive offers the highest available capacity in the 2.5 inch form factor and runs off USB power ie. It doesn’t require an external power adapter like the ones available at 3.5″ form factor. The drives are compatible with both Windows and Mac’s and come bundled with NTI Shadow backup software for both the Windows and Max OS X, which include version control and continuous backup when the drive is connected, According to Toshiba these Hard Drives are able to handle a 29-inch drop (non-operating) as well as a 4-inch operating drop.
The Technical specifications are as follows

 
 
  • Capacity: 100GB/120GB/160GB/200GB
  • Small Footprint: 23.6mm (H) x 88mm (W) x 142.1 (D) (0.94″ x 3.5″ x 5.6″)
  • 8MB Buffer
  • Weight: 1lbs 1oz
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From the day i have had a PC , i also have data which i just cannot dispose off , a very large collection of MP3’s and a humongous collection of movies and videos , which i have painstakingly organised and then burned on to CD’s and DVD,s . No matter how much disk space you have you always manage to fill it up , installation of a new game always results in some reorganisation , moving files around and deleting a few files to free up some space.

40 or 60 GB especially SCSI drives are now obsolete , no one buys them and they are available for throw away rates at sites like e-Bay etc , so the cheapest viable option for mass storage could be maybe an array  14 of such disks in a RAID configuration, this is an interesting project by Inventgeek which I happened to  stumble upon , for those of you who want to ramp up your storage for a low cost,  it makes an immensely interesting project , Yes I know RAID is slow and RAID is old , but it does’nt really matter with all those video and audio files which are are rarely used but we just cant part with them plus it has the WOW factor

Recently Hitachi announced their 1TB hard drive which is now on top of my must have’s list , but the product will be available only around 2nd quarter 2007 . I don’t see the trend slowing down anytime in the future and Storage technology pioneers like Hitachi , Seagate and Samsung have all had some exiting new announcements . The most impressive of them being PMR and Hybrid storage technology

All HDD’s store data in form of tiny areas of either positive or negative magnetization on the disk surface each of these areas represents a ‘bit’ which is the most elemental form of information, these bits are written as circular ‘tracks’ on the surface in a longitudinal fashion , one could visualise it as how bricks are laid for construction, but in a circular fashion .There are millions of bits on a single track and there are thousands of such concentric circular tracks on a hard disk surface. The amount of data that can be stored depends on the Areal density per square inch of the disk. Areal density is defined as the number of bits/ inch (along the track) * tracks/ inch (radially on the disk) , the data capacity of a HDD is directly proportional to the areal density, advancements in storage technology have till now been primarily focused on increasing this parameter, but in recent times it has become exceedingly difficult to increase areal density by conventional methods because the magnetic material on the disk surface is composed of small grains, each bit written on the disk must cover about 100 grains to ensure that the information is reliably stored, the catch is that there is a lower limit to the size of these grains, below this limit data integrity is compromised in normal working conditions.
In perpendicular recording, the ‘bits’ point up or down perpendicular to the disk surface as opposed to the conventional method of bits being aligned longitudinally, visualize this as a lot of bricks placed on their smaller ends one atop another to form a tower of bricks , these images from Hitachi illustrate this better

this allows more bits to be squeezed in the same amount of space , PMR disks offer higher data capacities at increased speeds and are inherently more robust than their traditional counterparts.
Hitachi GST is the intellectual property leader in PMR and their website has more detailed information about PMR and other research projects, for a fun and interesting look at PMR click here. I ll be writing about hybrid storage as soon as i get some more insight about it , for some basic information visit the hybridstorage forum