What is the difference between a compact flash card type 1 and type 2? (will a 1 work in a 2 slot)?

There have been two different versions of Compact flash in the past.





Compact Flash 1 is slim....


Compact Flash 2 is a little bit wider ..... normally used with the IBM Microdrives (it's a mini hard drive) Used to offer better memory size but now the technology has kept up... Type 2's are pretty much redundant now.





But yes Compact Flash 1will work in a 2 slot....


But not the other way around as it's bigger......