I have a Windows XP Professional SP 3. In my C drive, I have a lot of folders which I do not know why they exist. Sample these names – 1da9de11ed14f5da3b6ace4e25f5 a0332ef3abcaf03e49 What are they? Why are they created? Can I delete them? Solution: These are most likely leftovers from the installation process and it…
Case:The customer’s U disk unplugged the computer directly without normal exit. Today, the computer found that the data was lost. Check the U disk attribute.There are important data for preservation. Solution:First analyze the underlying sectors of the U disk, and find that the MBR information of the 0 sector and the partition table information are…
The SD memory cards known as the “Secure Digital” first began as miniature cards. Afterwards the new and advanced form of the SD memory card SDIO “Secure Digital Input/output” was introduced into the market. The SDA “Secure Digital Association” included new features and technology to the SD memory cards. The SDA included new varieties of card functions. These new card functions included wireless “Local Area Network LAN” devices, cell phones, GPS receiver, digital video camera etc. The memory card readers that were used in the Secure Digital devices connected to the Universal Serial Bus (USB). The Windows Operating System detects and manages the SD (Secure Digital) memory cards through the driver called the (USB) Universal Serial Bus mass storage. The (SD) Secure Digital host controllers are supported by the Operating System. The Operating System connects the host controller SD to the Peripheral Component Interconnect (PCI) bus. When the SD-host controller is detected by the operating system, the “SD Secure Digital bus driver” is loaded by the operating system OS. When the SD card is inserted by the user, the windows Operating system loads two drivers the “Storage mini-port” and the “SD Secure Digital Storage Class”. These two drivers are loaded on top of “Bus driver” by the Windows Operating System. On the other hand if the SD memory card of a different function like the wireless Local Area Network (LAN) or the Global Positioning System is inserted by the user, then the Windows Operating System loads the driver that is supplied by the vendor. It is necessary that both the vendor supplied and the native drivers in the (SD) Secure Digital stack communicate with “Secure Digital Bus”. The device drivers call the routines to communication with the “Secure Digital Bus”. These routines are called in the static “Secure Digital Bus library”. When the SD Secure Digital drivers compile, it is necessary that they link to the “Secure Digital SD Bus library”. There are some limitations for the SD device drivers. The “Host Controller Register” is not directly accessible by the Secure Digital device drivers.
The SD device drivers call the routines of “Secure Digital Library”. Then the Secure Digital Library forwards the Secure Digital commands to “Host Controller”. Music can be stored in the Flash Memory card and it is most advantageous than storing it in the Hard drives. The SD flash memory cards consume less power and are more portable. The SD flash cards also have resistance to shocks. The SD card facilities its users and they can easily record the data to their personal liking like music, pictures. The users can easily carry and move the data with ease and comfort. The SD memory card has the technology to fulfill the requirements of the future networked society. The tiny SD memory card provides many advantages to their users. These memory cards are highly compatible and they can link to different digital equipments. Because of the compatibility of the SD memory cards, their usage is more likely to expand even more in the future. The SD card has now become a standard of memory cards that are used for digital connectivity. In the near by future, the SD cards will be universally accessible to more wide array of Multimedia data. The size of the SD memory card is approximately 24mm x 32mm x 2.1mm. The design of the SD card is very compact and slim. Therefore, they are easy to handle and the user can easily transfer the data.
The devices that are compatible with SD card can play video clips & music with the help of “decoder software”. The DVD & CD players use “drive mechanism” while the SD memory cards do not require “drive mechanism” to play the video clips. So, this gives the product designers more freedom and they can be more creative and innovative. The other popular form of the SD memory card is the miniSD memory card. The size of the mini-SD card is approximately 20mm x 21.5mm x 1.4mm. The miniSD card is smaller in size than the SD card.
The SD memory cards have different recording capacitates, their capacity reaches up to 8GB. The large capacity helps to store the High quality videos. The demand for high capacity SD cards with fast data transfer speed has increased because of the increased digital content range. The SD cards also have the technology of “Copyright Protection”. This “Copyright Protection” technology enables new distribution system. This provides safety and security to the illegal copying of the data.The SD card has built in technology called the Key Revocation. The SD memory card has “Control Circuit”, which allows to read & write the after the detection of the external devices. The data is written and read within the “protection area” of the card. The authentication among the digital devices has to be enabled so that the SD card could be accessed.
So I have a Windows 7 home machine with 2 user accounts. One is a standard user account and one is an administrator account. Now this is going to be put in the hands of a very low-tech user so I don’t want them to be able to see the administrator account on logon, but…
HDD Printed circuit board (PCB) with board number 2060-701572-002 is usually used on these Western Digital hard disk drives: WD5000BEVT-60ZAT1, DCM HHCVJHBB, Western Digital 500GB SATA 2.5 Hard Drive; WD5000BEVT-11ZAT0, DCM HBCVJBBB, Western Digital 500GB SATA 2.5 Hard Drive; WD5000BEVT-35ZAT0, DCM HHCVJHBB, Western Digital 500GB SATA 2.5 Hard Drive; WD5000BEVT-00ZAT0, DCM HBCVJHBB, Western Digital 500GB…
How do I uninstall Deep Freeze manually using registry? Solution: I’ve been using Deep Freeze for a while, and I never uninstalled it with the registry. It seems to have a way to do this anyway – see How to manually uninstall Deep Freeze. You can also read more in How To Uninstall Deep Freeze…
Most SCSI and SATA RAID controllers will accept different kinds of hard drives. The hard drives should match in capacity points and rotational (RPM) speed. At best, all drives in an array will be identical–at the same firmware revision level.
RAID can be used with any size hard drive. The smallest capacity drive will determine the largest logical volume size for all drives in the array.
Whenever possible, select drives from an approved vendor drive compatibility list. This ensures that the hard drive is tested, and should function reliably with your SCSI or SATA RAID controller. Untested configurations can possibly work as well. But for best results, select only tested and compatible drives for your SCSI or SATA RAID controller. Most SCSI or SATA controller vendors publish a hard drive compatibility matrix on their web site.
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The Causes & Solutions of Two Main types of Noise which is occurred in WD HDDs (Especially Related To L-shape PCBs).Continuous Noise & Clicking Noise
1- The Continuous Noise
Sometimes there is a continuous noise come from WD HDDs mainly with L-shape PCBs
with motor ICs (Smooth 1.3) , (L6278 1.7) & (L6278 1.2).
the noise is like : Trrrrrrrrrrrrrr or Trrrr….Trrrr…Trrrrr
so all we have to do for fixing this problem is:
1- clean the connection points which connect the head stack pins with the PCB using a pencil Rubber …carefully.
2- clean the motor IC pins thoroughly using a solvent & Toothbrush then wipe it with a piece of smooth handkerchief to remove the dust & dirt from it.
-Note- the two steps mentioned above solve the problem in few cases.
3- If the two steps mentioned above didn’t fix the problem , you have to replace the motor IC cause it’s damaged.
2-The Clicking Noise
when u 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 u 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 it’s Damaged u have to replace it. but before that, u have to check Transistor Q3 , it’s a 6 pins transistor , for measuring this transistor u 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.
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-Note- in case of Motor ICs (L6278 1.7) & (L6278 1.2) first try to desolder them then resolder them again before u decide to replace them with a new ones … this sometimes work , but if it didn’t work … replace them directly.
– in case of Motor IC (Smooth 1.3) you must replace it directly.
The image below shows you where to clean.
Case:According to customers, the server is based on the RAID 5 of 8 groups, which mainly stores the hospital’s patient information.Due to improper operation, the server suddenly turned off and turned off, restarted immediately, and could not enter the system. Only 5 plates could be recognized in the RAID interface, and RAID data recovery was…
Case:The original mobile hard disk of the Western Digital, 1TB, model is WD10EALS. The hard disk is forcibly power -off and the hard disk cannot be identified. Solution:Data recovery engineers tested the hard disk connected to the professional data recovery detection equipment, heard the hard disk knock -clicking, and stopped by knocking a few times.Engineers…
