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SANDISK EXTREME IV CF 4GB | 
 enlarge | Brand: SanDisk
Category: CE
Buy New: £30.42
New (30) from £30.42
Rating:  7 reviews
Sales Rank: 1344
Media: Electronics
Autographed: No
Memorabilia: No
Fragile: No
Batteries Included: No
Shipping Weight (lbs): 0.3
Dimensions (in): 19.7 x 19.7 x 19.7
MPN: SDCFX4-4096-902
Model: SDCFX4-4096-902
UPC: 619659027926
EAN: 0619659027926
ASIN: B000I00DCW
Release Date: November 26, 2006
Availability: Usually dispatched within 4-5 business days
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| Customer Reviews: Read 2 more reviews...
 Perfect for photography June 5, 2008
Stephen H. James (United Kingdom)
2 out of 2 found this review helpful
The Sandisk range of memory cards are second to none.
This Extreme IV card is superfast (I thought the Extreme III was fast) and I can recommended this card to any amateur/professional photographer without reservation, it is top spec.
Always buy original SanDisk products and beware of cheap copies being offered from abroad (grey countries) and on some auction sites.
Amazon.co.uk is a great place to buy any product.
 JD May 30, 2008
Ms. Justine Daly (UK)
I have to agree with Mastervoda (the review below). Unless you own a serious camera which can benefit from the Extreme VI, I'd stick with the reasonably priced Extreme III. I purchased the Extreme VI (8GB) and noticed no difference over the III when it came to shooting at high speed or, taking long exposure shots which can sometimes take a while to write onto the card.
 Failed after six months May 17, 2008
CBPhotography (UK)
1 out of 1 found this review helpful
Lost a day's worth of photographs. Now unformattable so useless. Not good for a high end product which retailed at 49.90 when I bought it. Now off to try and exercise Sandisc's lifetime warranty. Not at all clear from any of the sites how you do this....
Beware of counterfeit version of this card May 10, 2008
Nic D (Scotland, UK)
27 out of 29 found this review helpful
I've rated the item low simply to draw attention to counterfeit copies of this product being sold. I bought a "SanDisk IV 4gb" card from an independent seller and only got round to using it well past the date I could claim back for it.
It garbled a lot of the data (though thankfully I had the recovery software from other genuine SanDisk cards and managed to extract about 75% of the images - the recovery cd sent with the bogus card was unreadable by Windows).
Having now looked closely at the card, the top part reads 'CompactFlash'. Compared to my genuine cards, this looks extremely faint. There is also a typo on the reverse of the box which reads "Super fast read and wrie speeds" (note the 't' missing from 'write'). I have no idea whether this also occurs on the genuine box but it might be symptomatic. Other than this it unfortunately all looks genuine.
Beware of the low prices being asked for this card. You might end up getting what you pay for! I recommend you buy it from Amazon (or other reputable dealer) and approach independent sellers with caution. Hope this helps.
 Can you Digital SLR take the speed? August 13, 2007
MasterVoda
135 out of 138 found this review helpful
I bought this card and was very happy with it, but I didn't really notice any speed benefits over lesser quality cards.
I didn't think the card was at fault as it performed well enough and wasn't about to believe that Sandisk would provide an Extreme III as an Extreme IV! I looked into my Canon Digital SLR, that was a revalation!
Apparently all Canon and Nikon Digital SLRs cannot make use of the enhanced speeds of the Extreme IV, Nikon's latest cameras use the PIO5 transfer standard for Compact Flash (their SD cameras are excluded) so they can make use of the Extreme III which supports PIO5 and PIO6 but Canon don't even go that far (Ultra II covers the most advanced standard they support)!
It seems that although these cards are very, very fast with the correct readers that support PIO5 and PIO6 standards, most of the Digital SLRs do not (unless we are going into the price of a sports coupe territory for cameras). I sent my Extreme IV back and bought an Extreme III. The speed is just as fast, maybe 100k/s slower but not enough to make any difference in a Canon 5D or lesser camera, and this would be true if the card was an Ultra II. However, the price difference between the Ultra II and Extreme III makes it silly to go for the Ultra II as many card readers can make use of the better transfer speed from card to PC (plus the Extreme III has a better warranty and compatibility with the newer Nikons, and hopefully Canon if they ever catch up).
My advice is if you want the best, get the Extreme IV for pure flash (no pun intended) value. If you want performance and budget, the Extreme III represents the very best with no noticable speed difference - bear in mind that the lower capacities are faster, so a 1GB card is faster than a 2GB card which in turn is faster than a 4GB card etc.
In real world tests it's found that a 2GB Extreme III can transfer data off a Canon 5D Digital SLR slightly faster than a 4GB Extreme IV, so the real world difference is negliable.
The price difference however, is not.
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