disk test minor improvements

[molnart]

Recently I had to do a few disk surface tests (successfully killing an SSD in the process ) and I have found some little annoyances:
- saving the images of tests exports in jpg format. These screenshots should be saved as png for better readability. the jpegs are quite heavily compressed
- when running a WRITE & READ test the read test starts immediately after the write part. it seems theres no way to get back to see (and save) the results of the write test - which is the more interesting one.
- when running a destructive test there are two confirmation windows warning about the destructivness of the test. it would be helpful if the warning message contained the name of the disk that is going to be overwritten.

hopefully these things are easy to implement and helpful for other users as well

[hdsentinel]

Thanks for your message and the suggestions !

Will examine the possibilities about using PNG format and also to save the result of the write test too.

About the confirmation: maybe you noticed that the underlying Disk menu -> Surface test window (where you selected the drive) still shows the drive, exactly to allow double-verification (in addition to the 2x warning messages, just to be 100% sure). So you can verify there, maybe by slightly moving the dialog box just to be sure. Even if you'd select the Configuration tab (to adjust test options) the main "Surface test" tab is automatically selected again to make sure that the drive is displayed for verification purposes.