By NLee the Engineer
on 1969-12-31 This Sandisk 'class-4' micro-SDHC card is faster than a PNY 'class-10'
I purchased a SanDisk 32 GB microSDHC Flash Memory Card SDSDQM-032G
nearly two months ago, for use in my VIZIO 8-Inch Tablet VTAB1008
. At the same time, I also purchased a higher-priced PNY 32 GB microSDHC Card (P-SDU32G10-EFS2)
which is supposed to be a 'class-10'. My benchmark results, however, show that the Sandisk class-4 card is actually faster - most of the time.
I used two sets of benchmark programs. One is called 'Flash Memory Toolkit v2.0', which measures the random read/write speed of files between 1MB and 15MB. The other one is called 'H2testw v1.4', which measures the sequential read/write speed using 1GB files. Here are my results: (see my uploaded charts in 'Customer Images' section for details)
- For smaller files (1-5MB), the Sandisk class-4 card gives an amazing write speed of 15-17MB/s, while the PNY 'class-10' card can only get 1-6MB/s
- For larger files (10-15MB), the Sandisk and PNY cards are about equal at around 8MB/s for write
- For huge files (1GB), the PNY did better at 9.5MB/S, while the Sandisk dropped to 5.5MB/s
- The read speeds of both cards are equally high at around 18MB/S (this number may be limited by the maximum speed of my card reader used)
What the above shows is that: When used in a typical digital camera (with file size 3-5MB), this Sandisk 'class-4' card is at least twice as fast as the PNY so-called 'class-10' card. But when used in a HD video camera (sequential writing of huge file), then the PNY card should perform better.
For a card to be marketed as a 'class-10', it must maintain a MINIMUM write speed of 10MB/s. So by this definition, the PNY card does not qualify since it cannot even achieve a MAXIMUM write speed of 10MB/s. This Sandisk card, on the other hand, exceeds the requirement of 'class-4' by a huge margin.
Sandisk seems to be the only flash memeory manufacturer that still gives honest, conservative speed class ratings. Any other manufacturers would have labeled this card a 'class-6' or even higher. As a matter of principle, I rather give my money to a company that promises less but delivers more, instead of to others that do the opposite. At the present cost of about 1 buck per GB, this is an unbeatable deal!
The capacity of this card, as reported by my computer, is only 29.7GB. Note that this is actually normal, because compter people define one 'Giga' as '2 to the power 30', which is 7.4% greater than 1 billion. So 29.7GB comes to just about 32 billion bytes, which is '32GB' according to marketing people.
[Update Dec 3, 2011]
I re-tested the two cards above, using the CrystalDiskMark v3.01. The results are consistent with my previous finding. See my newly uploaded charts in 'Customer Images' for details.
[Update Nov 19, 2013]
The Sandisk card is still working fine after two years in my tablet. It should be noted that I have purchased dozens of CF/SD/microSD cards over the past decade, and only experienced ONE card failure (which was caused by an incompatable card reader). So I'm probably just more careful in handling memory cards. For example, I always make sure to discharge myself electrically before touching a card to avoid ESD zap, and use "Safely Eject USB Device" command to remove a card.
1 Stars By Susan on 2016-10-18
Defective and Bad Card!
This card is horrible! Do NOT buy this memory card. Mine went corrupt in 3 weeks! ! ! Lost ALL my images off my MotoG3 phone.
You can imagine how I felt...
This is NOT good quality coming from San Disk and I buy all San Disk and Lexar cards ( for my D500 ).
1 Stars By Thomas matthews on 2016-04-28
This card worked well for 7 months and then failed - poor quality
I have been using this micro SDHC card now for about 9 months even though I bought it more than 3 years ago. The card worked flawlessly for 7 of those months until about 2 months ago when my LG G4 phone started reporting that the SD card was not mounted. And then it would mount. The number of times that the unmount message kept appearing increased in frequency until it stopped giving me the message. Little did I realize that it stopped giving me an warning message because it failed to be recognized by my phone. I noticed this when checking my phone's storage settings and no longer saw the micro SD card.
I removed the card and re-seated it in the phone but to no avail. Next, I removed it from the phone and tried to insert it into my PC reader adapter. It saw that a new USB drive had been mounted but no files or directories were detected. After trying another adapter (USB 3.0) I tried a USB 2 reader. Here's where I'm not sure whether it was the USB 2 adapter or the fact that I left it in the reader for 10 minutes and it eventually saw the drive and directories. I had started reading forums on bad SD cards and apparently the 32GB micro SD card from SanDisk has a significant number of reliability problems. I found dozens of users whose SD card worked for a while and then all of a sudden, stopped. None of the forums that I viewed had any suggestions other than to contact SanDisk for a replacement or to leave it in the reader for a while (in my case it was 10 minutes) and maybe you will be able to read it. In my case, I'm copying over the whole SD card to my PC so that I can salvage the hundreds of pictures I have taken, that have not been copied over already.
Since I purchased this card years ago, even though it's only been used for about 9 months, I can't expect SanDisk to replace it. But, I think SanDisk has a quality issue for 32 GB micro SD cards based on the number of people having the same problem. I gave it one star since I've only been able to salvage a dozen pictures out of the hundreds taken.
5 Stars By mlph on 2016-06-08
Bought one for myself, then another for my husband ...
Bought one for myself, then another for my husband. Works as expected, it is an SD card, not too much to say about that. Put in our phones, formatted and moved a TON of stuff over to clear out room on our phones (S5s) that were acting weird, from what I suspected were storage issues. Randomly closing apps, freezing up, etc. After installing these and cleaning up and moving everything we could onto the SD cards, issues have been resolved and phones are working normally once again. Wish I had realized the problem sooner, would have saved me a lot of aggravation.
5 Stars By DMGenest | on 2014-01-05
Nice and Easy: 32GB SanDisk microSDHC Flash Memory Card [Class 4 Speed Rating]
I decided to wait a bit to review this High Capacity (SDHC) card and it has been over a year now.
I have to say there have been no problems using it as external memory on my media player. This
little bugger does what it says and does not fail. Transferring files onto the card went very fast
and without a hiccup.
Just some cautions: Make sure you use this 'HC' card in a player that is compatible. The 'High
Capacity' card is not backward compatible. In short it will not work if you don't have a device
that can utilize the' High Capacity' format. Although most devices that support an 'HC' card will
usually support a regular SD card.
The uses for this Class 4 card, as designated by The SD Association, are for High Definition (HD)
video recording and Full HD recording (720p to 1080p/1080i). You should test your card on a Full
HD setting to see if you will have any problems like lag, or artifacts, because the card speed may
not be able keep up with your digital camera setting. You can also drop the Resolution down to
see if the card performs any better.
One more thing to check is that if you have an older device see if it can handle a 32GB capacity
card. Some older devices will not recognize higher capacity cards. It is always best to check with
your owners manual prior to buying a new card, whether it be a higher capacity or one with a
faster transfer rate.
5 Stars for this little powerhouse and no complaints due to its solid performance over the last year.
5 Stars By Peter Suslock on 2012-04-11
Sensational Micro Memory Card At an INCREDIBLE Price
I was given a Samsung Galaxy 3 gig smart phone by my better half - I'm not into smart phones but figured I would see what everyone is talking about and limp along into the 21st century.Most review sites encouraged the use of a data card so I looked around. A 16 GB from Sprint sells for $79 - owch. Prices weren't much better elsewhere especially when I started to look at the big guns - the 32GB cards.
When I found them here on 2DayDeliver for a mere $22 I thought it can't be - the very best price I found was on a site that looked a bit shaky for $99.99 and that was on sale. Click - add to cart - buy.
The cards which are incredibly tiny and arrive in sealed retail packaging, very carefully wrapped and shipped in a sturdy box.They're effortless to install and when I hooked the phone up to the computer to access the Sandisk site each card was authenticated immediately.
The free software for organizing stored media was downloaded, the phone formatted the card in a nano second and that was that.
The card comes with an adapter - which you use if your computer has a card reader. If not you should probably pick one up. The readers upload data much faster than if you use your phone.
Be careful opening the package - there's a tiny strip of paper with your Sandisk password on it - you'll need that to register.
The 32GB holds a massive amount of media, songs, photographs, movies - even books and magazines - they also lessen the work load on the CPU within the phone.Most Smart Phones will automatically switch over to the additional storage when they need to - so there is absolutely nothing to do, it's all done for you.
Having a card is also a great way to back up anything you don't want to loose.We ended up with two 32 GB cards at half the price of a single 16GB card.
Only on 2DayDeliver - I think I'm past asking how they do it.
1 Stars By J on 2013-07-18
This product worked fine from late November 2012 till 18th of July 2013.
Then it died during data sync!
No warnings, no malfunctions or any indication whatsoever that there is something wrong with it. I can even testify that the phone (Samsung Skyrocket) did not get too warm during that procedure so overheating can be discounted as an issue.
SanDisk 32 GB Mobile microSDHC Flash Memory Card SDSDQ-032G-AFFP is not being recognized anymore by neither the ICS nor Win 7 and cannot be formatted.
Before the malfunction, data exchange, moving files back and forth from the card to PC was flawless, although I did it only a couple of times since last November. Please take under consideration that I have used this card as secondary storage for music files and pictures with my Samsung Skyrocket, and as such I did not work it too hard.
If anyone wants to use this product as reliable storage I would recommend against it. If you decide to use this card as primary or secondary storage with your phone or pad anyway, please be sure to do a backup quite often as - based on my experience- you do not know the day nor the hour when this thing may fail.
Considering money spent: I will just go and buy a new one at Walmart or Target as it will ensure less hassle returning or exchanging should something go wrong.
Hope this review helps someone avoid a headache of recreating files, picture albums or playlists to say the least, because at this point I only hope I have backed up all data I had on that card.
5 Stars By Marc Strand on 2012-11-14
Great memory card for my mobile phone (and tablet too)
I bought this for my new HTC One V mobile phone from Virgin Mobile. 32GB is the max my phone is supposed to take, and this was the best price I found for a 32GB SD card. You can get faster 32GB cards, but since my phone is set up for Class 2 or Class 4, why spend more money for a faster card than my phone can use? I've had this card for a couple on months now, and I've had zero problems. It works just fine, and it didn't cost that much, so it's another good deal on 2DayDeliver for me.
Update 8 May 2014: 2DayDeliver only lets you review a product one time, regardless of how many times you buy it. Fortunately, they let you buy it as much as you want, so I've now purchased 4 additional SanDisk 32GB microSD class 4 cards over the past 2 years. And each card has performed flawlessly. Two of them went into Nook HD and HD+ tablets, which allows my wife and me to run CyanogenMod Android as part of a dual boot system. (See [...] if you're looking for an excellent way to do this.) The others went into my wife's phone and our grandson's Chinese Android tablet. The Nook applications in particular are very demanding, and some other brands of memory cards simply don't work in Nooks -- but SanDisk cards have worked perfectly, and they have also worked perfectly in our phones and our grandson's tablet.
Best card for the money. Buy it once, rely on it to work for a long time...and smile. It's as simple as that.
5 Stars By Marcos on 1969-12-31
Genuine SanDisk Micro SD 32 Gigs at Incredible Value
I purchased the 32 gig for my phone as a replacement for an 8 gig. I've had no problems with speed, data transfer, etc. SanDisk makes the best SD cards out there in my opinion, and I payed about 20 bucks for this one with shipping - a 32 gig chip the size and width of my pinkie nail for 20 bucks. I'm planning on buying another to backup the important docs on my HD... Who needs an external harddrive when you can back up to these monsters?! I'm not a techie person, I'm sure there are benefits to using an actual optical harddrive over backing up to to an SD, but seriously, the price for a genuine SanDisk at 32gigs with shipment for 20 dollars is unbeatable. On top of that, I can fit a boat load of videos, movies, music and pics on my phone, I can even make a lo-fi film by using these!
SanDisk also has a 64gig (Holy crap) micro SD but I haven't been able to find it for under 60 dollars. It would be great for constant filming, but aside from that you can just swap out another 32 gig.
ALSO: The one star ratings that claim these are not genuine SanDisk products are bogus... Read the comments to this particular one and you will find an argument from an industry savvy person that essentially proves that is impossible.
The seller does falsely advertise Retail Packaging... it doesn't come that way. Frankly, I don't care. As long as it's new, genuine, and works (IT IS) I don't care. Again, read the comments that debunk the scare that bulk packaging may mean it's not sandisk... this is 99.99% impossible. It happens, but it wouldn't continue to be selling like hotcakes on amazon. These are not "chinese knock offs" as the one star string starts off claiming...
PS ALSO BOUGHT AN 16 gig later to replace my 4 gig Pro Duo in PSP (bought an adapter for it too, obviously) and it was dirt cheap for genuine sandisk. I mean well under ten dollars, and the shipping was free. Wow.
5 Stars By Eagle Eyes on 2012-02-17
Works great in Nokia C6-01.
I purchased this card to max out the memory in my wife's Nokia C6-01. She ran out of memory on a 2GB card and then on an 8GB card because she takes a lot of pictures and videos of our boy. This 32GB card should provide her some free space for a while.
The phone has recognized all 32GB of the card's capacity and the card works fine. I think the card is fast enough for this application.
Nokia C6-01 keeps all apps and photos on the card becasue it has very limited internal memory. Prior to swapping the card I backed up the phone in hopes that after I install the new card I'll be able to run a restore procedure and all of the stuff will appear on the card. I excluded pics and videos from the resore to save time and just copied them to my compter. Well, I had an inkling that as usual with Nokia something may not work as expected, and indeed, after I installed the new card and ran the restore, only contacts, messages and calendar were restored. Apps and navigation maps were not restored to the new card. I had to re-download apps and maps,which took time. However, all is well now.
I tried to open the card's packaging without scissors, and it required some serious tearing and mawling with my teeth and nails. The packaging is made of cardboard reinforced with plastic - a little too secure for this type of product, in my opinion. I recommend using scissors.