Start with information about the right drive
HDDScan is a free Windows utility by Artem Rubtsov for examining supported storage devices. It can display identification information, SMART attributes and temperature, then run selected surface or internal drive tests. These tools help investigate a storage problem, but they do not repair damaged hardware or guarantee that a disk will keep working. A normal report is one observation, not a substitute for an independent backup.
Select the physical device by model and capacity before looking at results. Multiple disks with similar names can easily be confused, especially when external enclosures are connected. Keep a note of which connection and computer produced the report. This context helps when comparing later observations or discussing a problem with a technician.
Check the published compatibility limits
The official site offers version 4.1 and lists Windows XP SP3, Vista, 7, 8 and 10, plus restricted Windows Server 2003 support. Windows 11 is not explicitly included in that published list. Extract the download to a writable folder; the developer says not to run the program from read-only media. Obtain the archive from the official download page rather than assuming every similarly named disk utility is the same product.
Support includes ATA and SATA hard drives, supported SCSI and SAS devices, certain USB or FireWire bridges, and SATA or ATA SSDs. The documentation limits RAID volumes and USB flash drives to surface tests. Do not infer universal NVMe support from the word SSD. A controller or bridge may hide information even when Windows can access the files normally.
Separate reading from overwriting
Begin with identification and available SMART information. If a further test is appropriate, read its description first. Read and Verify have different data paths, and the documentation notes restrictions on verification through some connections. Internal short or extended SMART tests also depend on the device. Run one test at a time and allow for other applications affecting observed response times.
Erase is destructive: it writes a pattern over the selected blocks and destroys their previous contents. It is not the right choice for checking a disk whose files you want to retain. Likewise, advanced acoustic, power-management and spindle controls are not general fixes for a slow computer. Leave unfamiliar settings unchanged while collecting diagnostic evidence.
Interpret results alongside the symptoms
A slow block or an unusual attribute needs context: connection, workload, model and repeated changes can all matter. SMART raw values are not interpreted identically by every manufacturer. CrystalDiskInfo offers another way to review supported health information, while smartmontools provides more detailed command-line inspection for compatible devices. Neither can turn an unavailable metric into proof that the disk is healthy.
Reading also stresses a device. If it clicks abnormally, repeatedly disconnects or contains irreplaceable data on failing hardware, stop ordinary testing and prioritize a suitable recovery assessment. Repeating long scans can consume the time in which data remains readable. Save useful reports for comparison, and remove serial numbers before sharing them publicly. The practical outcome of diagnosis is a decision about backups, replacement or further investigation, not a promise of extra drive life.
