I will leave the 1st question for Inc. owners, I am just a visitor.

SDHC is the SD High Capacity which is 4GB and above.
The class is the speed of data transfer, 2 slowest and 6 fastest, keep in mind that the faster the more expensive the card would be. And sometimes you will not see any benefit by getting the faster card due to the device's speed.

 

I'm using this card without problems:

Kingston 8 GB microSDHC Class 4 Flash Memory Card SDC4/8GB

Amazon.com: Kingston Class 4 microSDHC Flash Memory Card: Electronics

SDHC just refers to the higher capacity (≥4GB). The largest supported on this phone is 16GB.

Class refers to the speed of the card. I don't know if the phone can take advantage of a card faster than class 4. And even if it can, I didn't feel is was necessary (and it's much more expensive).

Class 2: 16 Mbit/s (2 MB/s)
Class 4: 32 Mbit/s (4 MB/s)
Class 6: 48 Mbit/s (6 MB/s)
Class 10: 80 Mbit/s (10 MB/s)

 

It's not a miniSD it is a MicroSD there is a difference, I'm using an ADATA 16gb class 6 card with great results, it was pricey though, 61.00 from Newegg.com

 

i thought it supported 32gb?

 

Verizon states 16GB maximum. HTC states Up to 32 GB card support.
There you have it. Anyone actually test a 32GB yet?

Verizon's claim: Enter your location
HTC's Claim: HTC Mobile Phones - DROID INCREDIBLE Verizon - Overview

 

Well I think it supports 32GB microSD but I don't think there is but one out right now, made by sandisk, and if you did find it, it would cost as much as your phone...

SanDisk ships 32GB microSDHC card for $200 -- Engadget

 

I picked up a 16GB one on newegg for $42...works perfectly...

Newegg.com - SanDisk 16GB Micro SDHC Flash Card Model SDSDQ-016G-A11M

 

Cool, that's a good price, what class is that card? 2, 4, or 6?

 

When I was looking through the microSD cards on Newegg, I noticed the numerous cards don't have a class rating, the sandisk card above included.

 

Got my 16gb micro SD off amazon, for $34 shipped.

It's only a class 2 but it works great for what I use it for. I downloaded some HD video on watched it on my ps3 using the card to see if speed was a problem. Took a lil while to DL the 4gb file to the card but playback was perfect on my big screen

 

Got my 16gb micro SD off amazon, for $34 shipped. r

It's only a class 2 but it works great for what I use it for. I downloaded some HD video on watched it on my ps3 using the card to see if speed was a problem. Took a lil while to DL the 4gb file to the card but playback was perfect on my big screen