Disk test fail on Cycle 26 - Butterfly seeking

[mosslin]

Hi
I test several HDDs of same model on different platforms and OS by using cyclic mode, but change the seek count to 10000, and all HDD was frozen on cycle 26 - Butterfly seeking.
And if i don't change the seek count to 10000, it is pass.
Does this is a bug? what the seek count is? does it can't change to 10000?
Please see the attached picture and give me some answers, thank you.

[David (PassMark)]

V6 is now pretty old.
Can you see if you have the same problem with V8.

From the help file.

Seek count
For test modes that perform seeking to different positions on the disk drive (e.g. Random data with random seeking), the seek count specifies the number of seeks for a particular iteration (e.g. After Random data with random seeking has created 100 test files, the Seek count specifies the number of times a seek should occur between blocks within these 100 files).