I created a thread about Sandisk Extreme III cards last week - http://forums.overclockers.co.uk/showthread.php?t=17673337
What I found was that in the end my cards ran at the 20mb/s speed they were rated at after buying a new CF reader so they werent a cheap knockoff - could be a good test for others to try but as different CF readers dont work at the same speed it may not be too helpful! 3 of the ones I tried didnt get upto 20mb/s but the new crucial one I did runs at full speed and copying a few 1gb cards is so quick now!
Sandisk said the serials were genuine but unless they had the cards with them they couldnt confirm that the serial numbers werent just copied on there (so having a genuine serial number isnt always the end of the horror!). Mine have good serial numbers and run at 20mb/s so I'm sure theyre genuine - plus I bought two from two different places and theyre exactly the same
1. Check if possible they run at the correct speed stated
2. Check they have individual serial numbers - all cards have different serials so if you buy two and they both have the same serial number then you know you've been had!
3. If the above fails buy a different brand to sandisk from now on which is what I'm opting for as I cant take the stress of wondering if the card I'll get is genuine or not lol
My 1GB Extreme III cards look like this on the back:
What I found was that in the end my cards ran at the 20mb/s speed they were rated at after buying a new CF reader so they werent a cheap knockoff - could be a good test for others to try but as different CF readers dont work at the same speed it may not be too helpful! 3 of the ones I tried didnt get upto 20mb/s but the new crucial one I did runs at full speed and copying a few 1gb cards is so quick now!
Sandisk said the serials were genuine but unless they had the cards with them they couldnt confirm that the serial numbers werent just copied on there (so having a genuine serial number isnt always the end of the horror!). Mine have good serial numbers and run at 20mb/s so I'm sure theyre genuine - plus I bought two from two different places and theyre exactly the same

1. Check if possible they run at the correct speed stated
2. Check they have individual serial numbers - all cards have different serials so if you buy two and they both have the same serial number then you know you've been had!
3. If the above fails buy a different brand to sandisk from now on which is what I'm opting for as I cant take the stress of wondering if the card I'll get is genuine or not lol
My 1GB Extreme III cards look like this on the back:

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