From NazYura Krasnodar's web (archived): https://web.archive.org/web/20140213173048/http://nazyura.hardw.net/000006.htm
These Small Utilities, Basically, Are Intended For Studying Service Area Of HDDs
afua_wd - Advance Format User Area for WD drivers
(Format Calibrator)
Advanced Format User Area for WD drivers
(Not For Marvell CPU)
check_fl - Check Control Sum Flash Files For WD-Marvell
Check Control Sum Flash Files For WD-Marvell
(Check CS For PM Loader Config Strings And
PMCBlk - Programm Memory Code Blocks)
chk_csum - Check Control Sum For Modules WD-HDD
Check Control Sum For Modules WD-HDD
(Shows Correct Value For Correcting Byte)
(For Marvell CPU)
chk_wd - Quick Check Modules In Reserved Area For WD
Check Modules In Reserved Area For WD-Hdd
And Find Modules Not Enumerated In DIR-Sector
(It Is Correct Interprets Name Of The Modules)
mavr_cpg - Read CodePages On Hdd-WD (Marvel-CPU)
Find And Read CodePages On WD-Hdd
(For Marvell CPU)
mavr_fl - Read Flash On Hdd-WD (Marvel-CPU)
Read Flash On WD-Hdd
(For Marvell CPU)
mavrik - View Modules On Hdd-WD (Marvel-CPU)
Find And Check Modules On WD-Hdd
(For Marvell CPU)
mavr_r - Read Modules On Hdd-WD (Marvel-CPU)
Read Modules On WD-Hdd
(For Marvell CPU)
mavr_t - Read Tracks On Hdd-WD (Marvel-CPU)
Read Tracks On WD-Hdd
(For Marvell CPU)