It's a 3.5" bay originally designed for floppy drive or card reader on mini tower desktop. Any 3.5" hard drive or generic 2.5" to 3.5" harddisk mount should work.
I have same question. This is a mystery on my 7010 & 9010 MiniTowers. This "bay" opening is a bit too narrow & the mounting holes don't align to a 3.5" hard drive. I am not sure if the bay aligns to a 3.5" floppy. I am a bit suspect if this is a feature on the external drive cage that simply isn't used in the 7010 & 9010 series Optiplexs?
That chassis was used for different models besides Optiplex's. Bmcowboy is right in the assessment that it was used for card readers. I think some older Inspiron's had that and the Vostro 470.
bmcowboy
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Posted January 24th, 2019 20:00
Hi @Gromit83 ,
It's a 3.5" bay originally designed for floppy drive or card reader on mini tower desktop. Any 3.5" hard drive or generic 2.5" to 3.5" harddisk mount should work.