Case:The boot was not reflected, and the hard disk could not be recognized. Solution:After the engineer was tested as a circuit board, the circuit board was replaced and the chip information was replaced. The data recovery rate was 100%
half-duplex 
A communication protocol that permits transmission in both directions but in only one direction at a time.
hard drive
An electromechanical device for information storage and retrieval, incorporating one or more rotating disks on which data is magnetically recorded, stored, and read. The principal products of WD.
hard error
An error that is repeated every time the same area on a disk is accessed.
hard sectored
A technique that uses a digital signal to indicate the beginning of a sector on a track.
HDA
Head disk assembly. The mechanical components of a hard drive, including disks, heads, spindle motor, and actuator.
head
Also known as a read/write head. An electromagnetic coil and metal pole that read/write magnetic patterns on a disk. A drive with several disk surfaces or platters has a separate head for each data surface. See also MR head.
head actuator
A motor that moves the head stack assembly in a hard drive to align read/write heads with magnetic tracks on the disks.
head crash
The damage incurred to a read/write head when the head comes into contact with a disk surface. A head crash may be caused by severe shock, dust, fingerprints, or smoke, and may damage the disk surface and/or head.
head loading zone
The area on a disk reserved for heads to take off or land when power to the drive is turned on or off. No data is stored in the head loading zone.
head stack assembly
An electromechanical component containing read/write heads and their supporting devices.
headerless format
The lack of headers or ID fields (track format). This format enables greater efficiency and increased user capacity.
HFS
Hierarchical File System. File system developed by Apple Computer for use on computers running Mac OS.
high-level formatting
Formatting that erases all information on a hard drive and sets up the system for storing and retrieving files.
host
The computer to which other computers and peripherals connect. See also initiator.
host adapter
A plug-in board that acts as an interface between a computer system bus and a hard drive.
host interface
The point at which a host and a drive are connected to each other.
host transfer rate
The speed at which a host computer can transfer data across an interface.
hot plug
Act of swapping out a hard drive without having to power down the system or reboot. Hot plugging capability promotes system design flexibility, data availability, and serviceability.
hot swap
See hot plug.
HTTP
Hypertext Transfer Protocol. Protocol used by the World Wide Web to transfer information between servers and browsers.
HTTPS
HTTPS (HTTP over SSL) is the use of Secure Socket Layer (SSL) or Transport Layer Security (TLS) as a sub-layer under regular HTTP application layering. HTTPS encrypts and decrypts user page requests as well as the pages that are returned by the Web server.
hub
A multiple port connection point for network devices, often used to connect segments of a LAN.
I would like to share a folder from a Linux Guest with a Windows host (with read and write access if possible) in VirtualBox. I read in these two links: here and here that it’s possible to do this using Samba, but I am a little bit lost and need more information on how to…
Case:One data resumes two database files, saying that the database suddenly disappeared, and lost for no reason. After I recovered with the software, myDyeerp_new_data.mdf could not be loaded, and the customer’s own ERP software could not be used. Solution:Customers restore the resumed database to the corresponding folder directory of the hard disk, so the possibility…
Case:A government unit of Dongyang-AIX system server data recovery. A collection system on the customer unit uses IBM small machine AIX system server. Two hard disks are dropped. The server cannot start. The server consists of 8 hard disks.A need to restore an Oracal database and corresponding program code. Solution:Data recovery engineer testing, this AIX…
Case:The database was used normally the day before. When I used it yesterday, I found that I couldn’t connect to the database. I couldn’t try it several times. Solution:The Oracle 6G database stored on this hard disk is unable to access the data due to the hard disk bad sectors. The engineer uses professional data…
Case:After the U disk card is connected to the computer, double -click the disk formation prompts not formatted.Check the disk management and can’t find the card.Customers found two different companies in Yigao Computer City to recover, and after a week of recovery, they said they were unable to recover. Solution:Data recovery engineer testing. Fortunately, when…
About SalvationDATA Data Recovery: It has been 10 years since SalvationDATA entered data recovery field and started to create data recovery tools. SalvationDATA has aimed high and worked very hard and has now grown to be one leading manufacturer in the world for equipment of data recovery, computer forensics, HDD repair, data backup, data wiping…
Advanced Format hard drives is a new technology which can be attributed as a milestone in the class of hard drives. The older format hard drives used to have a 512-bytes physical sector size and this has been the case since the invent of the hard drives in 1956. Advanced Format changes the physical sector size from 512-byte to a larger chunk of 4096-bytes while the logical sector size remains 512-bytes. This is attributed as a milestone as it will tremendously increase the performance of the hard drive for larger files while smaller files will perform slower than normal.
So how does this Advanced Format more efficient than the legacy 512-byte one? Let’s take a birds eye view at how this format works. When sectors of the hard drive are read, they are read sequentially by the head of the hard drive and the head reads after every 512-bytes of data. While Advanced Format hard drive head will read after every 4096-bytes of data combining eight 512-byte chunks into one sector which increases the speed of the head as it has to read less no. of time (8 times less theoretically).
This Advanced Format (AF) is still very new and is not supported by all the Operating Systems. If we take a look at Windows Operating System, only Windows Vista and Windows 7 support this Advanced Format. There are software and drivers for other Operating Systems like Windows XP for Advanced Format to work.
With the performance advantage, Advanced Format hard drives have some issues with the the mismatch of physical and logical sectors. I have already told you that the AF hard drives have the physical sector size of 4096-bytes and logical sector size of 512-bytes. The problem comes when you partition the hard drive and the logical partitions don’t align with the physical sector sizes. This is not a big problem but still can have some effect on the performance of the hard drive.
If you have an Advanced Format hard drive and are facing performance issues, you can test the alignment of the partitions of your hard drive by using a free tool called Disk Alignment Test. You only need to download the tool and run it. It will automatically detect and scan the AF hard drives installed in the system. The software comes in both command line and graphical user interface. You can select whatever you are comfortable with. If you are using the graphical tool, the partition with red color is the one which is not properly aligned. If you see a red partition in your hard drive, you should go to the next step otherwise relax because you are not a victim of alignment problem which this new technology causes.
If you see the red partition, then you have to identify the manufacturer of your hard drive. Most manufacturers who manufacture AF hard drives have tools to fix this problem. You can search their respective websites for the fix for this problem. Otherwise you can use a universal fix tool called Paragon Alignment tool which will fix this problem for you.
Guest post by Usman who runs his own Technology Blog.
HDD Printed circuit board (PCB) with board number 2060-701640-006 is usually used on these Western Digital hard disk drives: The 2060-701640-006 Western Digital PCB repair process can usually be divided into 2 steps: find a replacement PCB and firmware transfer. 2060-701640-006 Western Digital PCB: Board Number Finding a donor Western Digital PCB board is easy,…
