-95%
SanDisk Extreme 8 GB, Class 10 (30MB/s) - SDHC UHS-I Card - (SDSDRX3-8192-A21) Reviews

SanDisk Extreme 8 GB, Class 10 (30MB/s) - SDHC UHS-I Card - (SDSDRX3-8192-A21)

2 ratings (2 Epinions reviews)
Share This!
  Ask friends for feedback

Where Can I Buy It?

$12.95
279.30
+$5.75 shipping eBay
$13.99
+$13.06 shipping PCM

Sandisk's ultra-durable prosumer memory card

Nov 2, 2008 (Updated Nov 2, 2008)
Review by  
Rated a Very Helpful Review

Pros:Rugged and fast, necessary to max out high-end camera speeds

Cons:Excessive if you don't need the speed/capacity

The Bottom Line: Write to a fast, durable card and you won't have to worry about not getting the shot due to a slow card, or losing precious photos.


This review is of the 8GB SDHC (Secure Digital High Capacity) 20 MB/second line of cards.  SanDisk came out with a 30 MB/second edition of the Extreme III line, but if you don't see "30 MB/second" on the box, that means it's the regular, 20 MB/second line.

Speed is important. Imagine data is like water, and your camera's built-in buffer is like a funnel, and the write speed of your memory card is like the width of the funnel's tip, and the memory card in your camera is like the container below the funnel.

If you take a whole lot of photos in a row, it quickly fills up the funnel. Once the funnel is full, your camera is unable to take new photos and has to wait for the water level to recede.  How fast that water goes down in the funnel depends on the width of the funnel's tip (the speed of the card). If the card is slow, it's like a funnel with a very narrow tip. If the card is fast, it's like a funnel with a wide tip. Thus if you take lots of photos in a row, it's good to buy faster memory cards (wider-tipped funnels) so that your buffer clears up faster and lets you take more photos with less waiting time.

Not all cards are equal. Memory manufacturers will skimp on three things in particular: write speed, durability, and compatibility.  But SanDisk did NOT skimp with this card:

1. Write speed.

First off, the SDHC "class" convention for classifying speed is outdated.  SDHC cards are classed as Class 2, 4, or 6, which means that the cards are rated at a minimum read/write speed of 2, 4, or 6-or-more MB/second, respectively.  The problems is the "6-or-more" part.  A 6 MB/second card is Class 6. So is a 30 MB/second card, even though it's five times faster! So Class 6 doesn't tell you a whole lot.  That said, this card reads/writes at 20 MB/second and is a Class 6 card, but it's more than three times faster than the slowest Class 6 cards.  (20 divided by 6 is more than 3.)

Second, beware of read/write speed discrepancies.  Generally cards are all fast in reading speed, but that matters less than the speed to which a card may be WRITTEN to.  Watch out for manufacturers that advertise only their fast read speeds without saying anything about their write speeds. If they don't brag about the write speed, that's a red flag that the write speed is slow.

SanDisk Extreme III memory is rated at minimum 20 MB/second read AND write speed.  This is consistent with the performance I got out of my NIKON D90 camera in 4.5-frames-per-second mode where I could snap off about 9-10 JPG+NEF photos in a row before the camera's buffer got overloaded.

This is way faster than anything on the market needs, short of a multi-thousand dollar pro-grade camera/camcorder, but that's a good thing, because you wouldn't want to have to keep buying cards.  So while 20 MB/second is probably at least twice as fast as your device can handle, that won't be the case a few years from now when newer devices come out that need faster cards to maximize performance.

Similarly, 8 GB sounds like a lot today, but that's what people said about 2 GB SD cards a few years ago.  If you "over-buy" a larger, faster SDHC card, you won't have to keep buying new cards and watching your old cards obsolete as often.

There is an advantage of lower-capacity SDHC and CF cards, though: it means that fewer layers of NAND solid-state memory were used, which means less electrical interference and thus slightly faster performance.  It's not much, and a 4 GB Extreme III and an 8 GB Extreme III will be within 10% of each other in terms of read/write time. Furthermore, if performance meant everything to you, you would be better off with an Extreme IV card which is over twice as fast (45 MB/second).

2. Durability.

How would you like to go on an expensive vacation and take once-in-a-lifetime photos only to come home and see that all of your photos are ruined because the memory card got corrupted? And you call up the company that made the card, and the most they can do is send you a new card--but you've lost those priceless photos! Worse, that new card is just as untrustworthy as the old one, so why would you even want the new card?

Reliability is hard to quantify on a box, so reputation means everything.  SanDisk has a good reputation among flash memory makers, and they have ruggedized the Extreme III series, claiming that their cards can withstand temperature extremes of -13 degrees to 185 degrees F (-25 to 85 degrees C).  SanDisk also claims that their cards are vibration/shock tested, and they back up their words with a lifetime limited warranty.

3. Compatibility.

SD = secure digital. SDHC = secure digital high capacity. They both look alike, but the inside stuff is different.  SD cards are limited to 2 GB maximum capacity, though some manufacturers have made 4 GB cards that are not up to SD specifications and thus do not work with all SD devices.  SDHC cards have much higher capacities, but they are 100% incompatible with devices that can't read SD cards.  In sum:

- If you have an older device such as a card reader that can't read SDHC, you are forced to use SD cards with 2 GB or lower capacity.

- If you have a newer device that can read SDHC, it can also read SD cards. So you can use SD *or* SDHC cards.

This incompatibility is why SanDisk bundles its Extreme III SDHC cards with card readers--older card readers can't handle the new SDHC specification.

By the way, SD/SDHC is a proven standard and its only real rival is the CompactFlash (CF) standard. (Sony's memory sticks only work with Sony and a few other companies' gear; same with xD.  SmartMedia cards are already dead, as nobody supports them anymore.)

Why is SD/SDHC so popular?  It's small and cheap.  SD/SDHC cards are already small, and if that weren't enough, they make MicroSD cards for cell phones.  Using a converter, you can plug the MicroSD card into the converter, and the combo is the same size as a regular SD card.  And SD is cheap enough to make it cost-competitive with CF.  CF is perhaps more durable simply because it's a bigger form factor and has more physical room to put the memory chips in, but the price difference between the two has really shrunk over the years.

The bottom line is that SDHC is here to stay, and it may even displace CompactFlash in the future, as many low-to-mid-level cameras now take SD/SDHC rather than CF.  CF is still the format of choice for pro-level cameras--for now.

OTHER:

SanDisks's bundled card reader is USB 2.0 compliant and works with SD and SDHC cards. It comes with a pouch and a dust cover. Their bundled recovery software is useful if you accidentally deleted all your files and have to recover them--but this often doesn't work if you reformatted the card. Reformatting a card does more damage than simple deletion and would require more advanced software to recover such lost files.  I found this out the hard way!

THE BOTTOM LINE:

This card is expensive but like I said, it's worth it for the reliability and speed. Pay twice as much now or pay later in terms of clogged camera buffers or corrupted data that makes the card worthless. I love this about the card.


Recommend this product? Yes

Read all comments (3)

Share this product review with your friends   
Share This!


1-18 of 18 best deals

1.888.209.5772 About me Contact Us Shipping Payments FAQ SanDisk 8GB Class 10, Extreme Secure Digital High Capacity (SDHC) Memory Card.SKU: IDSSD8GE3 ...
eBay
Store Rating: 4.0

279.30
+$5.75 shipping
SanDisk Extreme - Flash memory card - 8 GB - Class 10 - 200x - SDHC UHS-I
MacMall
Store Rating: 3.5
SanDisk Extreme - Flash memory card - 8 GB - Class 10 - 200x - SDHC UHS-I
PCM
Store Rating: 3.5
+$13.06 shipping
Electronics Cameras Computers Software Housewares Sports DVDs Music Books Games Toys in titles descriptions Company Info |Checkout Info |Shipping Info...
eBay
Store Rating: 4.0
Free Shipping
Find memory cards and thumb drives at Target.com! Capture and store your best shots ever with an extreme 8gb sdhc memory card from sandisk. Captures u...
Target
Store Rating: 2.0
Free Shipping
Take better pictures at up to eight times faster SanDisk Extreme SDHC and SDXC UHS-I memory cards offer enough speed, capacity, and durability to meet...
Office Depot
Store Rating: 2.5
17.40
+$9.95 shipping
Take better pictures at up to eight times faster SanDisk Extreme SDHC and SDXC UHS-I memory cards offer enough speed, capacity, and durability to meet...
Sears
Store Rating: 3.0
Welcome to Our ebay store... Shop categories Shop Pages Product Information SANDISK SDSDRX3-8192-A21 8GB EXTREME HD VIDEO SD CARD Item#: 672860 Brand:...
eBay
Store Rating: 4.0
Free Shipping
Usually ships within 7 business day
Sears
Store Rating: 3.0
Sandisk Extreme Sdhc 8gb Class 10 - Sdsdrx3-8192-a21 Brand: SanDisk UPC: 619659033156 Model: SDSDRX3-8192-A21
Sears
Store Rating: 3.0
Get the most out of your advanced cameras, DSLR, or HD camcorder with the Extreme SDHC UHS-I Memory Card. This card offers additional speed, capacity,...
Sears
Store Rating: 3.0
Sandisk Extreme SDHC 8GB 30 MB/s 200x Memory Card *NEW* When you need speed, go with the SanDisk Extreme 30MB/s Edition SDHC card and get more out of ...
eBay
Store Rating: 4.0
+$9.73 shipping
SanDisk 8GB Extreme HD Video SDHC Card
Sears
Store Rating: 3.0
SanDisk Extreme - Flash memory card - 8 GB - Class 10 - 200x - SDHC UHS-I
Sears
Store Rating: 3.0
56.99
+$5.99 shipping
About Us Ebay Store Shipping Returns Payment Top Brands:Plantronics Polycom Samsung Panasonic Garmin Motorola AT T Humminbird Norelco Braun Sony Oral-...
eBay
Store Rating: 4.0
Free Shipping
Sandisk Extreme HD Video 8GB SDHC Memory Card
Sears
Store Rating: 3.0
thetwistergroup Store SANDISK SDSDRX3-8192-A21 8GB EXTREME III SECURE DIGITAL HIGH CAPACITY (SDHC) CARD - (CLASS 6) - 8 GB Cannot be shipped to Canada...
eBay
Store Rating: 4.0
Free Shipping
SANDISK SDSDRX3-8192-A21 SanDisk 8GB SDHC Class 10 Extreme Flash Memory Card -Take better pictures at up to eight times faster SanDisk Extreme SDHC an...
eBay
Store Rating: 4.0
+$5.00 shipping
1-18 of 18 best deals     Why are these stores listed?