Recover Files from a Crashed/Corrupted Hard Drive

Some of the symptoms of a corrupted/crashed hard drive

You may have come across a case of a corrupted hard drive or maybe not. If a hard drive is crashed or corrupted, you will not be able to use it even though it will still show as a disk. Some of the common signs you’re likely to see if your hard drive is corrupted include:

 

You will experience an invalid media kind of reading such Abort, fail or retry?

  • The fail system will be displayed as the “RAW”
  • The windows can ask you if you would like to format by first warning you “disk has not been formatted, would you like to format it now?”
  • The files names will have “weird” names or characters
  • You will also experience “sector not found” type of messages.

A corrupted or crashed hard drive mostly has important folders and files, and it is very important to get them back. We first ask ourselves if there is a better method of recovering this hard drive without losing our important data. If you send it to a professional to service it, then be sure of spending some good money to retrieve, recover, save, and extract all you files. You can therefore choose to recover the files yourself by using good data recovery software. The recovery software will be able to recover your deleted, corrupted and formatted hard drive.

 

Below are the steps you can follow to recover your corrupted or crashed hard disk.

Step 1: Start the Pittsburgh data recovery software, then select on the corrupted hard drive-click on SCAN- this will enable you to search for any existing or lost files.

Step 2: A very quick scan will be launched first. And after it has been finished, a deep scan will then automatically start so as to find some more files.

Step 3: After the scan gas been completed, preview every listed file that has been recovered (only the word documents, emails, texts and photos are supported) and then select those you want to recover. After that, click on the RECOVER button so as to retrieve all your lost files back from the corrupted hard drive. It is important for you here to save all your recovered files on different device or drive in case the data recovery fails.

If you follow the above simple steps, then you will likely be able to recover you important data. It will also save you on the expenses that you would have incurred if you had taken it to a specialist shop.

 

Online Distributed Database Transaction And Recovery Techniques

Online Distributed Database Transaction And Recovery Techniques

When it comes to online, database failure can be disturbing. Losing valuable data can be depressing because sometimes data is lost accidentally when we least expect this to happen. But data loss prevention is one of the most vital issues involved in managing database systems. Data can be lost due to viruses, hardware failures, incorrect use of delete and update statements, and disasters, such as fire or flood, software bugs.

Implementing a recovery strategy for your databases can help avoid data loss. Here are some of the restoration techniques

Transaction undo or rollback

This method can be applied to do away with the undesirable effects of faulty transactions. Erroneous transactions include all operations that have altered the database into unwanted state and the operations that have used values written by the defective transactions. Therefore, transaction undo applies in situations where soft failures can result in the discrepancy of the database. Transaction redo is implemented to recuperate to a steady transaction state.

Checkpoint

This is when recording is done on the folder from the hardware shared data area. Checkpointing eliminates the redoing of transactions performed earlier. Periodical checkpointing reduces the recuperation procedure. There are two kinds of checkpointing:

Fuzzy: This is where all active transactions are recorded in the log at the time of checkpoint. Therefore, in the case of a power blackout or power failure, only those transactions that were active during checkpoint and later are processed. All other transactions, done before the checkpoint, are written to the disk, and there is no need for redoing.

Consistent: This checkpointing method generates a dependable representation of the database at the checkpoint. In the event of recovery, right side operations are the only ones undone and redone.

Database backup and Transaction log

This technique is useful in case of a hard crash or disk malfunction that may lead to overall loss of the database. A new drive is set so as to help recuperate from this disk fault and reinstate the operating system. And this is where the transaction log and database backing come in to complete the database recovery process.

The method includes:

l Redoing and writing of activity in the before-commit list and the commit list into the commit list in the operation log.

l Undoing and writing the transactions on the failed list and busy list into the terminate list in the operation record.

Bottom line

If you are concerned about your database and the transactions, backups can be vital in the event of any data loss.