Hello ( Laptop's optical HDD caddys )
Any info how many and what kind of micro switches a good optical HDD caddy should have ?

I know caddys come:
- In different height sizes: 7, 9.5 and 12.7mm.
- IDE or SATA connector.
- Different speed connectors\circuit boards: SATA-1,SATA-2,SATA-3.

I have looked that I need a 9.5mm and SATA connector but now it seems HDD caddys have different micro switches which functions I don't understand.

Micro switches' selections=channels seems different to some laptop brands:
- Like HP, Lenovo, Dell and Apple each have different selections...

Any info what kind of micro switched caddy should I buy ?
- Lots of caddy variations exist in China ebay.