H2testw will only write to free memory.
It will not over-wright firmware or existing information stored in the memory.
If you disconnect the program whilst it is running, you run the risk of corrupting the information being written. This may cause problems, it's like switching the power off your computer when it is writing to the hard disk (not recommended).
If your player stops working after H2testw has finished, then I am afraid that your player would have stopped working if you had filled it's memory with data (music/video). That would have been caused by the way the firmware has been hacked , not by H2testw.
The fact that H2testw will only write to free memory will cause an incorrect "OK" value if files are stored on the device when testing is performed.
Before testing, copy all files from your player into a temporary folder on your PC, so that you can put them back when finished.
Delete the files on your player and then run H2testw.
It will take a long time to run the test if your player is claiming 32Gb, wait until the program indicates that it has finished.
Make a note of how much memory is indicated as "OK".
I have a "RIZONE" player.
I used H2testw to test it, deleted the primary partition, created a primary partition using the H2testw information and then formated the partition.
My player still works, I fill it with audio books several times a week and never have problems.
I would recommend that people used usb cables from other devices or invest in buying a good cable because the cables supplied with these cheep players are pretty crap.
As far as the uncertainty of over-writing firmware is concerned, the "RIZONE" either has separate memory for it, or the only way to gain access to it is by using flash software.
H2testw will not over-wright firmware.
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