burn in test not align 4K

[SMTY]

Burn in 9.2 (1002)
I use same setting to test my drive, but sometimes tool will issue non 4 k align cmd

how can I modify?

Thanks

[David (PassMark)]

Even if BurnInTest writes 4K of data per IO operation, it doesn't always mean the start of the data is on a 4K boundary.
The location of the start of the test file is determined by the file system in use, and other factors like the cluster size.

It also isn't clear what the hex dump / trace you posted is showing.

[SMTY]

Thanks David,
What factors can decide start of data ?

The picture is bushound tool, it can trace bus(sata) cmd handshake.
The detail show as picture

Thanks

[David (PassMark)]

I don't know what options you are using in BurnIntest, but it is a combination of the file system in use (e.g. NTFS) and the mass storage device driver that determines what sectors are used to store a file.

Disk fragmentation and bad sectors might mean that a 4K write isn't written sequentially on the disk.