![]() In Erase mode the program prepares block of data field with special pattern and an LBA number.The program tests blocks one by one from minimum to maximum. The program reads block of data into a temporary buffer and measures time of operation for each block. In Read mode device reads block of data and transfers it thorough interface to the host controller.The program measures operation time for each block. In Verify mode device reads block of data into drive's internal buffer only and checks for consistency, there is no data transfer through an interface connector/cable.Verify test may work in unreliable way on USB/Flash devices.Verify test may have restrictions on Block Size with 256, 16384 or 65536 sectors because of Windows limitations.Author wasn't able to get stable test results with two or more simultaneous tests. The program should not be run from a read-only device/media.Windows XP SP3, Windows Server 2003 (with restrictions), Windows Vista, Windows 7, Windows 8, Windows 10.Spindle start/stop function on ATA/SATA/USB/FireWire/SCSI HDD.Reporting defect information on SCSI HDD.Changing AAM, APM, PM parameters on ATA/SATA/USB/FireWire HDD.Reading and analyzing identity information from ATA/SATA/USB/FireWire/SCSI HDD.Temperature monitor for ATA/SATA/USB/FireWire/SCSI HDD.SMART tests running on ATA/SATA/USB/FireWire HDD.Reading and analyzing Log Pages from SCSI HDD. ![]() Reading and analyzing SMART parameters from ATA/SATA/USB/FireWire HDD.Reading in Butterfly mode (synthetic random read).Reading in linear mode – same as verification but also transfers data to the host.Verification in linear mode – fastest way to determine if your drive needs data rescue, has recoverable errors or in its perfect shape.USB Flash (pen drives) – surface tests only.RAID volumes made of ATA (IDE) / SATA / SCSI HDDs (surface tests only).FireWire or IEEE 1394 HDD (see Appendix A).External USB drives and all major USB boxes (see Appendix A).If the number of bad sectors remains the same, all is well. If the number of bad sectors is increasing over time, contact customer service for your region for assistance. Storage Executive is a free downloadable tool that allows you to monitor your drive's overall health. Make a note of what that number is, and run ChkDsk again after a couple of days. You may also monitor the health your SSD by using Storage Executive. After checking the drive, ChkDsk will report the number of bad sectors it found. The easiest way to keep track of the number of bad sectors on an SSD is to run ChkDsk (short for "check disk") in Windows®. So even though the bad sectors are present on the drive they never come into play, and data is never written to them. The firmware on the SSD keeps track of all bad sectors and marks them as unusable. Due to the nature of flash technology it's normal to have a small number of bad sectors on an SSD, and as long as the number of bad sectors remains constant there is no reason for concern. The number of errors/bad sectors cannot be reset on an SSD. With a traditional hard drive, that is often the case, but with an SSD things are a bit different.
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