#85 Preparing disks doesnt work when "Write I/O Pattern" set to "Full Random".

[Jeff Byers]

On Windows Server 2016 and Windows Server 2012 R2, starting Iometer version 1.1.0 when preparing disks is required does not work when the "Write I/O Pattern" is set to "Full Random". Dynamo spews constant error=998 and prep fails. Disk preparation works when any other pattern is set. The work-around of course is to prepare with "Repeating Bytes", stop the test, then change back to "Full Random".

Worker 0 running Access Spec: 4 KiB; 100% Read; 0% random
Access specifications for test defined.
Grunt: Grunt data buffer size 4096 >= 4096, returning
Worker 0 setting targets...
Seeding random Number Generator(93070901603)
Generating random data...
Preparing disks...
\?\Volume{ff4063d7-d2ad-11e6-80c5-806e6f6e6963} preparing.
Preparing disks...
Error (immediately) writing 0 of 65536 bytes to disk \?\Volume{ff4063d7-d2ad
-11e6-80c5-806e6f6e6963}, error=998
Error (immediately) writing 0 of 65536 bytes to disk \?\Volume{ff4063d7-d2ad
-11e6-80c5-806e6f6e6963}, error=998
Error (immediately) writing 0 of 65536 bytes to disk \?\Volume{ff4063d7-d2ad
-11e6-80c5-806e6f6e6963}, error=998
Error (immediately) writing 0 of 65536 bytes to disk \?\Volume{ff4063d7-d2ad
-11e6-80c5-806e6f6e6963}, error=998
***Error (immediately) writing 0 of 65536 bytes to disk \?\Volume{ff4063d7-d2ad
-11e6-80c5-806e6f6e6963}, error=998