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By: Guy Fanse

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Friday, 25-Oct-2013 09:56 Email | Share | | Bookmark
DDS and DLT Backup Tapes

Two types of data tape that are both common and easy to use are DLT (now mostly Super DLT) and DDS. Here's a little information on each should you be interested!

Super DLT / DLT

This storage system is the most popular on the market today, the reason why it is a preferred method of storage is due to its ability to offer you with a high capacity in storage and its long lasting durability. The newest version available today is the DLT 8000 which can offer you with 40GB of capacity and can transfer data at 6MB per a second. The storage system offers you a way of string your data at the highest quality. Recovery of data is often easier with DLT data tapes as they lack the mechanical complexities that may arise through hard disk drive failure.

The Super DLT is a product used for quantum tapes which uses LGMR (laser-guided magnetic recording). This produces higher capacity and performance with a safer option for DLT drives. The capacity of this system can hold up to 110GB and transfers data at 11MB per a second and additionally can provide you with backward compatibility.

Digital Data Storage - DDS

DDS uses a technology known as helical-scan it is aimed for use in server applications. The media and the drive offer you with a compact form when used on small autoloaders. Below are the features offered by DDS tapes:

-DS has a capacity of 4GB and can transfer data at a speed of 366kps
-DS 2 has a capacity of 8GB and can transfer data at a speed of 1MBps
-DS 3 has a capacity of 24GB and transfers data at a speed of 2MBps
-DS 4 has a capacity of 40GB and transfers data at a speed of 3MBps

The DDS system is not a popular choice for use anymore as it produces low speeds and has very little space for storage.



Monday, 14-Oct-2013 16:20 Email | Share | | Bookmark
Data Recovery Reviews

http://www.data-recovery-reviews.co.uk is a web site that reviews data recovery services and companies in the UK.
With ever higher numbers of websites around that offer data recovery services, it's important to have a go to site containing reviews from data recovery customers up and down the length and breath of the UK.
The data recovery reviews website provides information from customers of data recovery companies who have sent their broken and faulty hard disks and RAID servers in to have either the hard drive repair &/or the data retrieved.


Saturday, 12-Oct-2013 16:38 Email | Share | | Bookmark
DataClinic's Tape Recovery and Conversion Service

I know these guys offered this a while back but it seems they've re-launched their tape recovery and conversion service.
It's without a doubt the most comprehensive tape recovery and conversion service available in the UK -I thought I knew a fair bit about data tapes but these guys are dealing with tapes that I've never even heard of…
We all know the usual DDS, DLT and LTO tapes, and even old floppy disks from the 1980's - like the 3.5" DD and HD (Double Density and High Density), remember those? and before that there were 5.25" floppy disks and 8" drives… Does anyone still keep valuable data on these?
Surprisingly, the answer is yes. Come to think of it, I remember writing my 2nd year computer project back in 1988 and saving it to a DOS based (at least I think it was DOS) floppy disk. I've still got it… in the loft somewhere..

Below are a few interesting details about DDS drives:

All DDS drives have a self head-cleaning mechanism. When the firmware detects some type of error, you might hear some clicking noise in the drive which may be the sound of self-head cleaning.

The head cleaning operation with a cleaning cartridge operates by transferring a very fine polishing surface round the top just like the regular cassette surface would touch. The drive ejects the cleaning cartridge without rewinding the tape. If it reaches the conclusion it must be discarded.

The length of head cleaning cartridge changes widely by the manufacturers. Sony's cleaning cartridge (DDS 5CL) includes 5 meter cleaning tape whereas Maxell's cartridge (HS-4/CL) has 12 meter tape.


Although HP's guides always say that the cleaning cartridge can be good for 25 cleaning operations, we've never compared the actual speed of the clean up pass as well as the duration of the cleaning action in one HP model to a different, it is difficult to believe that all drives with all brands of cleaning cartridge are good for exactly 25 cleaning operations.

Probably this is a self-defeating action whenever you manually rewind the
Head-cleaning cartridge and reuse exactly the same surface for a lot more than one pass.


Monday, 7-Oct-2013 09:28 Email | Share | | Bookmark
Reclaim your Western Digital Hard Drive Data

 
Modern devices are made by Seagate, Western Digital and Toshiba. All of them use exactly the same technologies - the data is saved on the high speed rotating platter that records and stores the data for some magnetic zeros and ones. This all seems quite easy and square does not it? But it's not, the drive inside your pc is just one of most complicated and intelligent bits of technology ever assembled.

If you are anything like me, you are using your computer a great deal. You use it in order to save family data, work data, your photographs, music and films. All of this data is saved on a part of the pc called the hard drive. Now that you understand that, it is pretty apparent the data in your hard drive is precious right? It does not matter as you could only get another one if the drive breaks if it's not then. However, if the data is precious how are you planning to change it? Here are five suggestions to consider in case you at any time require your Western Digital hard drive data recovered.

1. Do not suppose that data recovery in your hard disk is hopeless; even in the worst examples for example natural disasters, data recovery professionals have really been able to regain data.

2. Never remove the cover in the hard drive; this will just cause additional damage regarding the drive and hurt the possibilities of recovery

3. Don't try data recovery on your own. Recovery is really a specialist procedure - having a DIY approach often results in total loss of data since you often do not understand what you are doing.

4. Don't rest it on the moveable object or item of furniture, should you use and notebook or external hard drive. Vibration and shock can lead to serious injury to the hdd, worse still is when the hdd falls and hits the ground the harm caused will commonly be significant.

5. Don't subject the push to excessive temperatures changes both hot and cold. You might have read stories to the web about placing damaged hard-drives in freezers to fix them. All I tell this can be think of it, freezing a hdd is an useless exercise and can just damage it.


Friday, 20-Sep-2013 07:30 Email | Share | | Bookmark
Problems with RAW file recovery

Modern data recovery software has come a long way compared to the simple undelete tools of the decade or so ago. In place of relying exclusively in the file system, now's data recovery tools implement extremely complex algorithms enabling them to successfully recover files from raw volumes. This article describes algorithms that are used recover files from RAW disks volumes.

Finding Disk Volumes

It is vital to find all partitions (disk volumes) saved in the hard drive, before we start looking for individual files. Ordinarily, information regarding the volumes is stored at the start of the disc in a record called Partition Table. Partition tables include info regarding the start and end of the volume as well as its sort.

If this is really the case, it is vital to locate the volumes on the disc as a way to find the location of their file systems.

Discovering the File System
The best method to find disk volumes is detecting the existence of the file system, a construction which is normally stored at the start of the volume. Partition recovery tools typically presume that every volume has a data structures, when recovering information from a volume. In the event the partition table is damaged or no longer available, the tool must scan the disk trying to find available filesystem (or multiple file systems when the disk included multiple partitions).

Many filesystems have fixed signatures making them relatively simple to discover. These signatures are employed to detect the existence of the file store. If, after every one of the checks, the algorithm verifies the existence of a file store, the tool may then determine the start of a volume.

Scanning the Volume

After successfully locating all volumes, we can select a single partition to extract information from. It is vital to understand that raw hard disks may include damaged, corrupted, empty or inconsistent filesystem records; hence a good data recovery tool might not rely only on information saved in the filesystems. However, disregarding such information fully would not be a great idea, because the file system comprises records pointing to many types of files that cannot be discovered otherwise.


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