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Follow on Google News | How to Test Seagate Drives' Heads for HDD RepairThe following procedure should be used to test the Seagate drives' heads for HDD repair and you may need to use some professional hdd repair tools or data recovery tools.
By: Chris Wilson If a drive hangs at startup, perform the first part: * Switch the drive to Safe Mode. * Load boot adaptive data and SA defects list (you can do that manually or using the following HDD Commands F>R1 F>R2 or with the corresponding command from the loader start dialog). * Load App code (the easiest way to do that is through the loader startup dialog) and start it in Safe mode (from the loader startup dialog or using the F>j,,1 command) * When the drive enters the T> mode, load System Sectors (from the loader startup dialog or using the T>R command). Note: HDD commands mentioned above are used for drives equipped with Serial Flash memory only * Load CERT code ad CERT tables (the easiest way to do that is through the loader startup dialog). * Proceed to actual testing of the firmware and drive heads. Now you can proceed to actual testing of drive heads (the procedure from this step on can only be used when a drive does not hang during start). To do that you either need to run test 4 or attempt to switch heads manually. Heads switching test. To perform the test, use the ; (semicolon) terminal command to find out the number of heads in the drive (the MxHd parameter means the highest head number) and run the following series of commands: T>/2 2>s444,0,22( 2>U 2>H0 2>H1 etc., where the digit after 2>H stands for the number of the head to test. If a head can "see" the surface, it will be switched and the drive will respond with a message like: Head … where ellipsis will be replaced with the head number. The drive should output no other messages like $ or Head Mask or HM. If these messages appear or the drive hangs, then the head is damaged. Test 4. To perform the test, send the following command to the drive: T>T4 - then it will begin sequential attempts to use allowed BIAS reading current values for all heads. The drive will output to the terminal during the test a report similar to the following: T>T4 Begin Test 04 ASCII logging on LBA=1B4F93F1 ASCII logging off ASCII logging on Kick Off Test Testing head 0... DAC value = FD02 Biasing with current 0025mA DAC value = FBEA Biasing with current 0050mA DAC value = FAD2 Biasing with current 0075mA DAC value = F9BA Biasing with current 0100mA DAC value = F8A2 Biasing with current 0125mA DAC value = F78A Biasing with current 0150mA DAC value = F672 Biasing with current 0175mA DAC value = F55A Biasing with current 0200mA DAC value = FD02 Passed Max OD Bias Current = 0200mA. Limit = 0100mA Head Mask FFFF - Switch to full int. Spin Ready Testing head 1... DAC value = FCD7 …………………………………………………… and so on for all heads. If during BIAS sweep the drive hangs, begins long (infinite) output of the $ or Head Mask or HM messages, it means that the head is damaged. Here the “Head Mask FFFF - Switch to full int.“ message in the end of the example is produced after BIAS sweep and represents a part of diagnostic messages generated during recalibration; HDD repair tools recommended: More HDD repair tools or data recovery tools here http://www.datarecoverytools.co.uk/ # # # The best free data recovery E-book online! Learn from the very beginning of data recovery until your success in data recovery business filed. Find the most prevailing data recovery tools, the efficient data recovery tips here and free data recovery tools End
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