2026-04-29

Reinstalling the system leads to loss of desktop files and data recovery

DATARECOVERYUNION.COM01 mins

Case:According to Mr. Xia himself, he has a certain foundation for computer operations, but because of the negligence of re -installation system operation, forgetting to back up the desktop file, the important data on the desktop after the system is lost, and data recovery needs to be performed. Solution:According to customer descriptions and computer usage,…

Read More

Technologies used for maintaining HDD reliability

DATARECOVERYUNION.COM04 mins

With all the complications HDD manufacturers are constantly trying to make user data storage more reliable. To accomplish that they use various methods and technologies in their drives.

Figure 5. Control circuit of spindel of HDD (family WDAC 32500 and WDAC 33100)
S.M.A.R.T. (abbreviated Self-Monitoring, Analysis, and Reporting Technology) is intended to inform hard drive users about the status of its main parameters. Many motherboard BIOSes support analysis of those parameters at computer power-up and if some critical parameter exceeds its emergency limit an informational message is displayed during computer start-up. Of course, it does not mean that the drive will stop functioning, but the user should take some steps in that situation, for example, prepare a backup copy of valuable data. If computer BIOS does not contain an analyzer of S.M.A.R.T. attributes you can use an external diagnostic utility launched from within the operating system. The list of such utilities includes, for instance, SMART Vision available from http://www.acelab.ru/products/pc/traning.html.

For greater reliability practically all drives use a technology, which allows hiding and relocation of occurring defects immediately during operation. Some peculiarities of its implementation may vary with different drive models; however, they are all based upon the same principle. If the operating system attempts to access a sector, which cannot be read or written to, then the drive will replace it if possible (if there is sufficient reserved space) with a sector from the reserved zone (assign). The table of thus substituted sectors is stored in drive firmware zone and the drive loads it to controller ROM at power-up.

Impact sensors found in all drives also belong to technologies used for protection against malfunctions. It is a piezoelectric sensor producing an electric pulse at mechanical shock. Filtering of sensor pulses allows identification of obvious impacts. When a drive detects shock action, it parks magnetic heads. One peculiarity of impact sensor installation is the angle of its mounting relative to front case line. It is equal to 45O.

In recent models manufacturers have began to use widely temperature sensors in PCB and heads’ block. Temperature information is monitored by drive processor and the drive stops operation if the allowed value is exceeded. In some drive models temperature is output as S.M.A.R.T. attribute value and there are programs (usually available from the web pages of HDD manufacturers) which allow viewing it.

Read More

Computer Forensics For Dummies

DATARECOVERYUNION.COM02 mins

Computer Forensics For Dummies Uncover a digital trail of e-evidence by using the helpful, easy-to-understand information in Computer Forensics For Dummies! Professional and armchair investigators alike can learn the basics of computer forensics, from digging out electronic evidence to solving the case. You won’t need a computer science degree to master e-discovery. Find and filter data in mobile devices, e-mail, and other Web-based technologies.

You’ll learn all about e-mail and Web-based forensics, mobile forensics, passwords and encryption, and other e-evidence found through VoIP, voicemail, legacy mainframes, and databases. You’ll discover how to use the latest forensic software, tools, and equipment to find the answers that you’re looking for in record time. When you understand how data is stored, encrypted, and recovered, you’ll be able to protect your personal privacy as well. By the time you finish reading this book, you’ll know how to:

  • Prepare for and conduct computer forensics investigations
  • Find and filter data
  • Protect personal privacy
  • Transfer evidence without contaminating it
  • Anticipate legal loopholes and opponents’ methods
  • Handle passwords and encrypted data
  • Work with the courts and win the case

Plus, Computer Forensics for Dummies includes lists of things that everyone interested in computer forensics should know, do, and build. Discover how to get qualified for a career in computer forensics, what to do to be a great investigator and expert witness, and how to build a forensics lab or toolkit.

Read More