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A file called devrdisk2 in / - what is it ?

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when installing a 256GB SSD in my mid 2009 MBP I noticed a large file called devrdisk2 in the / folder


Note it iS NOT /dev/rdisk2. it is a 1.9GB file called devrdisk2


As I have downgraded (capacity wise) from a 500GB HDD to a 256GB SSD I am doing my best to conserve space I'd like to know if I can delete it - or I should say How can I delete it. I already tried by moving it to the documents folder to see if anything "broke" but it was just recreated in the / folder


Google search won't throw up anything on this file name


Is this some kind of "RAM Disk"



Any advice welcome




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