HDAT2 vs MemTest64

HDAT2 is a drive-testing and diagnostic program for ATA, ATAPI, SATA, NVMe, SSD, and SCSI/USB devices. Its device-level tools test drives and can repair bad sectors on detected devices. File-system testing covers MBR/GPT, boot data, and directories on FAT12/16/32, exFAT, and NTFS. SMART functions are available for ATA/SATA, SCSI, and NVMe drives. Capacity controls include SET MAX and Device Configuration Overlay, with options to restore full capacity; supported SATA and NVMe devices can also be switched between 512e logical sectors and 4Kn. HDAT2 detects devices on AHCI and some RAID controllers, and USB devices through USB ASPI or BIOS when supported. The main program requires a real DOS system booted from USB, floppy disk, or CD/DVD. A Windows 32/64-bit demo is available, but it operates only at drive level, omits file-level functions, and aborts almost all commands while simulating conflicts. The freeware plan is free, for one or more machines, with redistribution without profit; it is provided as-is without warranty.

MemTest64 is a free, standalone Windows utility for checking system memory for hardware-level problems. It runs inside Windows with a graphical interface, loading physical memory with test patterns and applying detection algorithms that identify errors automatically. You choose how much memory to test, which can limit the effect on other work. The utility runs without a reboot or DOS mode, does not require administrator privileges, needs no installation, and makes no registry changes. Listed processor support includes modern Intel Core and AMD Ryzen systems. Supported systems are 64-bit Windows XP, Vista, 7, 8, 10, and 11. TechPowerUp describes it as useful to overclockers adjusting memory timings and DRAM speeds. The utilities listing identifies version 1.0, dated April 20, 2017, and the product page links to a support forum.