Case:The customer’s mobile hard disk is divided into two partitions, which preserves two years of work data.After the mobile hard disk is connected to the computer, the computer cannot recognize the mobile hard disk, the data cannot be read, and the customer cannot recognize the mobile hard disk box after replacing it.After being introduced by…
Gigabyte (GB)
1 Gigabyte = 1,073,741,824 digital bytes / 1,000,000,000 decimal bytes, a unit of measure for data
Hard Error
a data error which is not able to be overcome when the disk is reread, it occurs repeatedly at the same location on the media, indicating a defect in the surface
Hardware
computer equipment (as opposed to the computer programs and software)
HC
High-speed CMOS)
HDA
Head Disk Assembly
HDD
Hard Disk Drive, magnetic storage device
Head crash
Occurs when a head and disk accidentally touch, thereby damages the media (and subsequently the data)
Head Landing Zone
Area on the media which is dedicated to head takeoff and landing, no data is recorded in this area
Head positioner
(see Actuator)
Host
the computer system that the drive is integrated into
Hot swap
replacement of hard drives, whilst computer is in operation with zero downtime
Host adapter
a plug-in board or circuitry on the motherboard that acts as the interface between a computer system bus and the disk drive
IC
Integrated Circuits. IC’s are arrays of electronic components such as transistors, diodes, resistors built from a single piece of semiconductor material. Huge numbers of components (millions) can be placed upon a single chip, the external connections being made via the pins on the IC package
IDE
Integrated Drive Electronics, a hardware interface that allows peripheral devices to be attached to a PC
IDE Controller
The controller translates commands from the computer into something that the hard drive understands
Interface
transmitters/receivers that establish links between various parts of a computer and facilitate the exchange of data between these components (e.g. IDE, EIDE, SCSI, and for notebooks PCMCIA). The way the drive and host communicate with each other. It is a standard defined by industry organisations
Interleave factor
the number of sectors that pass beneath the heads before the next sector arrives (a means to optimise performance of a drive)
Internal Transfer rate
the speed at which data is transferred to and from the media, reflected in millions of bits per second (Mbits/second)
Inside Diameter
smallest radius recording track on a platter
Inside Diameter
smallest radius recording track on a platter
I/O
Input/Output
ISA
Industry Standard Architecture
ISO
International Standards Organisation, sets standards for computer industry
ISO-9660
a data format designed by the ISO in 1984
Case:Fall the mobile hard disk on the ground, and then the hard disk cannot be recognized on the hard disk. The power -to -power prompt formatting will not be used normally. Solution:Data recovery engineers conducted a detailed detection of the hard disk. The magnetic head damage caused the disk to be unable to recognize. The…
OK, please, following you have an updated one step ahead question regarding my first question post on the title. The question now is, how possibly get some info or tracing/debug on, which possible reason is leading to this error referring to SYSPREP. In the net I found several posts for this, and the following link…
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 2060-701265-001 PCB…
I want to make sure that on 64-bit Windows, 32-bit application can be installed/run without any issues? And it is guaranteed by Windows backward compatibility? For example, any application (e.g. Microsoft Windows Media Encoder 9) which runs smoothly on 32-bit Windows 7 can run smoothly on 64-bit Windows 7. I am developing some software and…
Case:Customers took the old -fashioned hard disk recovery data of the Yituo IDE interface, and knocked on the disk after power generation. Solution:After testing, it was initially identified as a magnetic head. Because Ituo did not support the support tools, it can only be judged!After finding it for a long time, I found a similar…
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
Case:Personal customers can recognize the disk and the partition can be seen.However, the data file cannot be read, cannot be copied, and cannot be deleted.Even after double -clicking the computer crash, no operation cannot be performed. Solution:Data recovery engineer testing, the hard disk has a large number of bad sectors, use bad data extraction tools,…
Case:When the customer backup the data, he accidentally touched the backup hard disk to the ground, and then connected the computer to find that the computer speed was dragged very slowly.The customer immediately searched the information through the Internet and found that it should be a hard disk and hardware.The customer’s hard disk is an…
