Thank you, Fred -- CrystalDiskInfo indicated that drive as "good" before it became undetectable. Would the free version of Hard Drive Tune work for Windows 10?
[h=3]HD Tune[/h] [TD="bgcolor: #C0E0FF, align: center"] [SIZE=-1] Program [/SIZE]
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[TD="bgcolor: #C0E0FF, align: center"] [SIZE=-1] Version [/SIZE] [/TD]
[TD="bgcolor: #C0E0FF, align: center"] [SIZE=-1] Date [/SIZE] [/TD]
[TD="bgcolor: #C0E0FF, align: center"] [SIZE=-1] Filename [/SIZE] [/TD]
[TD="bgcolor: #C0E0FF, align: center"] [SIZE=-1] Filesize [/SIZE] [/TD]
[TD="bgcolor: #E0F0FF, align: center"] [SIZE=-1]HD Tune[/SIZE] [/TD]
[TD="bgcolor: #E0F0FF, align: center"] [SIZE=-1]2.55[/SIZE] [/TD]
[TD="bgcolor: #E0F0FF, align: center"] [SIZE=-1]12 February 2008[/SIZE] [/TD]
[TD="bgcolor: #E0F0FF, align: center"] [SIZE=-1]hdtune_255.exe[/SIZE] [/TD]
[TD="bgcolor: #E0F0FF, align: center"] [SIZE=-1]628 KB[/SIZE] [/TD]
[SIZE=-1]Supported operating systems: Windows 2000, Windows XP, Windows Vista, Windows 7.[/SIZE] [/TD]