Case:Municipal hospital server data recovery is the hospital’s registration system. Two hard disks form a RAID0 disk array, and the disk array is divided into four partitions.After the network management reinstalled system, it was found that except for the C -drive that could be opened normally, several other partitions could not be read, and it…
Now discuss the Causes & Solutions of Two Main types of Noise which is occurred in WD HDDs (Especially Related To L-shape PCBs).
Clicking Noise and Continuous Noise:
1- The Clicking Noise
when you power on the hard drive u will hear a noise like (click,click….click,click…click,click)
this noise may be related to the head stack or PCB, the first thing you have to do is to check the PCB By The following steps:
1)- first you have to clean the Whole PCB With a Solvent & Toothbrush then wipe it with a piece of smooth handkerchief to remove the dust & dirt from it.
Caution: Cleaning of the PCB must be done carefully to avoid removal of any small electronic components.
2)- Check the Resistor (R120), [the right value of this Resistor is (0.12 Ohm)], you may adjust your multimeter to Resistor Measuring Mode to determine its Value, if its damaged you have to replace it. but before that, you have to check Transistor Q3 , it’s a 6 pins transistor , for measuring this transistor you may adjust your multimeter to Diode Mode,[ the right Value will be: (first two pins = 0.000 , second two pins =0.000 , Third two pins = nearly over 600)]
if Q3 is Damaged it will burn ur R120 after u replace it , so be sure that Q3 is ok before replacing R120 & u may also Check Transistor Q6 by the previous method to be completely sure it’s safe to replace R120.
Note: ( to be sure of The right values of these electronic components u may compare the values u have measured with the values of a working PCB’s Components)
3)- Check The Coils (such as L2 & L7) – adjust your multimeter to diode mode then the right value must be ( 0.000 ) for any coil as u all know.
4) – inspect the whole PCB for any removed component (such as small capacitors or Resistors) … the removal of these small components may occurred while forced cleaning of the PCB…. so be careful while cleaning it.
5) – in rare cases the firmware microchip may be damaged.
On Windows 10 1809, I have enabled the in-built SSH server, and have configured it. On another machine, I have used WinSCP and PuTTy generator to generate an authentication key. I copied the public key portion and appended that to the .sshauthorized_keys file of my SSH server user. I fixed file permissions as required, to…
Striped set with dual distributed parity. Provides fault tolerance from two drive failures; array continues to operate with up to two failed drives. This makes larger RAID groups more practical, especially for high availability systems. This becomes increasingly important because large capacity drives lengthen the time needed to recover from the failure of a single drive. Single parity RAID levels are vulnerable to data loss until the failed drive is rebuilt: the larger the drive, the longer the rebuild will take. Dual parity gives time to rebuild the array without the data being at risk if a (single) additional drive fails before the rebuild is complete.
Advantages
Disadvantages
Recommended Applications
RAID 6 VS RAID 5
RAID 6
In complex arrays (12-24 drives), RAID 6 applications would be a preferred choice due to the fact that Serial ATA drives used in the arrays have a lower duty cycle and may be more likely to fail in 24/7 or business-critical applications.
Raid 5
In small arrays (4-12 drives), RAID 5 applications can quickly repair a failed drive and restore lost data-without taking down the array. It’s perhaps the most cost-effective, fault-tolerant data protection solution currently available for small storage devices.
Pro
Raid 6
Designed for tolerating two simultaneous HDD failures by storing two sets of distributed parities.
Raid 5
Con
Raid 6
Raid 5
Recommended Configuration
Raid 6
Disk array consists of 12 disks or more
Raid 5
Disk array consists of 10 disks or less
Recommended Solutions
Raid 6
Raid 5
I have a link to a deleted folder in “quick access” (frequent folders). However, I cannot remove it, because when I try to “unpin” it I get an error “Location is not available”. Somewhat related to “How do I correct Quick Access folder links?“, but with no applicable answer. Solution: The answer above was useful,…
Random Notes and Ideas For Data Recovery
HDD Printed circuit board (PCB) with board number 2060-701675-001 is usually used on these Western Digital hard disk drives: WD2500BMVV-11DCLS0, DCM HHBVJHN, Western Digital 250GB USB 2.5 Hard Drive; WD10TMVV-11A27S2, DCM EHBVJHBB, Western Digital 1TB USB 2.5 Hard Drive; WD6400BMVV-11A1CS0, DCM HHCVJHBB, Western Digital 640GB USB 2.5 Hard Drive; WD5000BMVV-11A1CS0, DCM HBCTJABB, Western Digital 500GB…
Computer viruses are proving to be highly complex but preventing viruses from infecting your computer systems is simple. Use two well-known brands of anti-virus software and keep them as current as possible.
Beyond that, there are some simple, common sense procedures that everyone should use, whether at work or in the home computing environment. Never open a file whose origins are unknown. In a simpler day, that wisdom only applied to executable files, or files that did something. They have the suffixes .exe, .com and .bat and each can start a program on your computer. These viruses spread through games downloaded from the Internet, on borrowed diskettes and through the old ‘bulletin board’ services.
Today, unfortunately, a whole new wave of viruses has been unleashed on unsuspecting computer users because software manufacturers introduced feature-rich new programs without considering how vulnerable they are to viruses. Now, almost any document and many email messages can carry and spread ‘macro’ viruses at lightning speed. That’s why it is so important never to open messages or documents from unknown sources. Viruses can delete data, change file names or even damage the physical media the data where the data is stored.
How important is virus protection?
If your data is critical to your business operations, there is nothing more important. Even though about 75 per cent of all data loss incidents are caused by human error or system malfunctions, a virus attack can still cripple your data center. A combination of regular, verified backups and constantly updated virus protection are absolutely essential to protect your data – and your organization.
What Procedure is Data Recovery assignment involved?
The following three issues are critical for your data recovery business. They includes the first (Technical Know-How) and the last two (Marketing Plan and Financial Resources) followed only if you can handle the first.
Technical Know-How: As this industry is professional, specialized know-how is required to handle the varied types of data recovery assignments. Generally speaking, there is 3+1 work flow applicable to all data recovery case:
Of all the stages, Stage 3–data retrieval, is the most widely spread and long-running; all data recovery companies, even end users, by downloading software, can handle mission of this stage easily. But according to SalvationDATA experts only 30 to 40 percent of all data recovery cases are simply stage 3 cases. The left percentage requires an ability to handle with the stage 2 and stage plus 1 issue.
Stage 2, disk data extraction, is also widely known and adopted as “disk imaging” by data recovery services nowadays. But to SalvationDATA, according our experience with lots of potential clients, they perform this important stage using ghosting tools designed for and work on good HDDs only, not the patient HDDs that are unstable or inaccessible because of media defects and instable head, which are common challenges of Stage 2 in practice. Even more, with those traditional imaging tools, the time involved and the ordinary user-level repeated-read access to the media bring a risk of damaging the disk and head, making data lost irretrievable.
Stage 1, drive diagnosis & restoration, is the primary stage in a broad sense data recovery flow but in fact deals with the deepest level in 3+1 broad sense data recovery flow. Unfortunately this Stage 1 is missing from most of the data recovery services or even noticed but was being done in a zigzag procedure or simply incorrectly due to lack of proper tools, meaning that they are putting away customers and profits. Our data has shown that up to 40% of data recovery cases have Stage 1 issues; and that IS NOT what going to happen that we can skip Stage 1 and perform Stage 2 and 3 and still to get certain percentage of data. You CAN NOT get anything in case you are not capable for the primary stage
Plus 1, it refers to Head or Platter Exchanger when encountered with motor seizure or head crash. This kind of problem often happens where the Drive is clicking or dropping from height. Concerning this issue, you need to replace the components and fix the mechanical malfunction first.
From above 3+1 work flow, you may get know the basic guidance of data recovery.
Then let’s move the following 2 factors which are relevant to your data recovery service.
Marketing Plan: It is the same as other service you are engaged in. It needs marketing plans and strategy. You should think more about customers’ convenience, satisfaction, price setting, and target market. If possible, you need advertising on different mediums too.
Financial Resources: Of course you need budget to get the business started before you benefit from your investment. You need facilities like a Clean Room and equipments to carry out the assignments. You also need to pay expensive technicians.
Supposing the Marketing and Financial investment are not the barriers to stop you, then you need think more about the facilities and data recovery equipments.
I have to admit that Data Recovery is a game for professionals and engineers to play, it is impossible to get started without any HDD Data Recovery Equipments provider.
SalvationDATA technology LLC, not unacquainted name in Data Recovery Industry, is the biggest and cost-effective solution provider all over the world. Their free technical support & Remote assistance and free updates, enhance the industry beginners’ confidence greatly and assist them to enter the industry as soon as possible.
We first look at the following two pictures. Picture 1 is the “BIOS CHIP” of the circuit board. When we replace the PCB, we need to swap the “BIOS CHIP” with your original PCB. Picture 2 shows the “Board Number” of the board, and the “Board Number” must be the same! FAQs of 2060-771737-000 PCB…
