Hello SSA_40,

You have to use drives that have an EMC part# that is on the support matrix for a unity system.  If the drive is not on the support matrix the drive will not be read and will be powered down and marked as bad.  Here is a link to the support matrix for a unity 350f. https://dell.to/3PtdSDm

I do not see a document that lists the performance of each. You may be able to use the sizing tool. https://dell.to/3XCn2zt or maybe there is something in the info hub. https://dell.to/3XF14f5 If not you may want to contact sales.