I bought HDD WD5003ABYZ-011FA0. I suspect that it is fake.
Here is info from CrystalDiskInfo5_0_5
Model : WDC WD5003ABYZ-011FA0
Firmware : 01.01S03
Serial Number : WD-[Deleted]
Disk Size : 500,1 GB (8,4/137,4/500,1)
Buffer Size : Unknown
Queue Depth : 32
of Sectors : 976773168
Rotation Rate : 7200 RPM
Interface : Serial ATA
Major Version : ATA8-ACS
Minor Version : ----
Transfer Mode : SATA/600
Power On Hours : 199 час
Power On Count : 38 раз
Temparature : 28 C (82 F)
Health Status : Хорошее
Features : S.M.A.R.T., APM, 48bit LBA, NCQ
APM Level : 0080h [ON]
AAM Level : ----
Relatively many disks (new in package) appeared last time of this model (not another) in small online shops in my city with chipper price then majority of online shops offer. It’s strange.
I have 2 the same disks. I’m going to bye additional 2 disks of the same model. But hasitate. They have the similar behaviour. Above are results of HD Tune of both disks I have.