Sandisk has done it again! It wasn’t long ago we reached the amazing 8GB mark for storage in the tiny format called microSDHC. Now we have in fact doubled the capacity reaching an impressive 16GB of storage on a medium no bigger than your average finger nail. The idea behind this post is try to clear misunderstandings behind the microSDHC format and see how a typical Nseries device, in this case the N82 black performs with the new 16GB cards.
Will my device support the new XXGB microSDHC card?
Often when new devices in the Nseries line are released, Nokia states the maximum memory (card) capacity they will hold based on the biggest available card on the market at that moment. Take for example the soon to be released N85. One look at the N85’s specs page you might think that the device only supports a maximum of 8GB microSD cards: “microSD memory card slot, hot swappable, max. 8 GB”. This leads to confusion and the obvious question: does my device support this new card? The fact is that a microSDHC-compatible device,for example the N82, N85, N95, N95 8GB they should (theoretically at least) support microSD cards up to 32 GB. It is recommended however, for the best performance and to clear compatibility issues, to get the latest firmware for your device. The guys over MobyMemory for example reported problems on their classic N95 in the form of “O/S freezing and rebooting when you try to open the Gallery or Music Player.” A quick update solved the problem as they reported that: “phone performance was rock solid and we saw no more of the unpredictable behavior”
Should I buy class 2, 4 or 6 cards?
SDHC cards have SD Speed Class Ratings defined by the SD Association. “These new speeds are available in a new specification defining the minimum data transfer speeds for both SD/SDHC memory cards and SD/SDHC host products. This enhancement is easily recognized by three levels of Speed Class, class 2, 4 and 6. Speed Class 2 guarantees a minimum transfer speed of 2 mega bytes per second (MB/s), Speed Class 4 guarantees a minimum transfer speed of 4 MB/s and Speed Class 6 guarantees a minimum transfer speed of 6 MB/s.” I’ve been reading the forums where some users got a “class 2” 16 GB card and wanted to exchange it for the class 4 model, claiming that the class 2 card was “slower and that it would “slow things down.” Fact of the matter is that these class ratings don’t talk about the maximum, but rather the minimum speeds. Class 4 cards are indeed faster, but are these overkill for Nseries devices? Based on previous tests done HERE, this how various cards scored using the Nseries and Internet Tablet devices:
1a)Sandisk MicroSD 8GB via card reader over USB 2.0 (Quick bench): 19.7 MB/s
Random Access: 1.9ms
CPU Utilization: 0% (+/-2%)
Average Read: 19.3MB/s
Random Access: 1.1ms
CPU Utilization: 4% (+/-2%)
Average Read: 10.6MB/s
2a) Nokia N800+ Sandisk MicroSD 8GB over USB 2.0 (Quick bench): 4.9 MB/s
Random Access: 3.2ms
CPU Utilization: 0% (+/-2%)
Average Read: 4.8MB/s
Random Access: 2.3ms
CPU Utilization: 0% (+/-2%)
Average Read: 4.9MB/s
Nokia N81 8GB (Quick bench):0.8 MB/s
Nokia N76 + Sandisk MicroSD 4GB (Quick bench):0.8 MB/s
Nokia N82+ Sandisk microSD 16GB class 2 (Quick bench):
As you can see it doesn’t really matter if it’s a class 2,4 or even 6 card as your average Nseries device has a wrting speed below the 1MB/s, well below the minimum specified by class 2 card. Only the Internet Tablets and the N96 which reportedly has a high write speed to memory cards will get the most of the higher classed cards.
How did the 16GB class 2 perform on the N82?
As indicated above, the N82 write speed to the card is well below the 2MB/s minimum write speed of the class 2 cards, so even the lowest class cards should be enough. Using my N82 with firmware v.20 showed snappy performance that was able to quickly open up the Gallery and show preview images of all media. Much quicker when compared to my N95 8GB. Having transferred 4GB of music to the card, the phone didn’t even a single slow down.
Conclusion
1)No matter what maximum storage capacity a manufacturer states, the maximum amount supported is determined by the microSDHC support, which supports a theoretical maximum of 32GB. A firmware update might be necessary.
2)Only the Internet Tablets with their 4-5Mb/s read speeds are able to take advantage of faster cards. The N96 is said to have a write speed in 4-5MB/s, but I’ll test this once I get my hands on a unit.
3)All current Nseries devices write to memory card or internal memory in the case of the N95 8GB and N81 8GB at a speed of 0.8MB/s making even class 2 card with their MINIMUM 2MB/s write speed perfect.
4)My usage with the new class 2 16GB in the N82 shows snappy performance, clearly supporting conclusion number 3.
5)Always choose a device with a card slot. The benchmarks above indicate that stand-alone card readers are capable of some insane speeds. In such a case you can take out the memory card from your device and use a card reader to take advantage of the higher speeds.
Also remember to visti MobyMemory for the latest 16GB cards!
To give you idea how the N81 8GB, N76 and N82 performed here are the results:
2b) Nokia N800 + Sandisk MicroSD 4GB over USB 2.0 (Quick bench): 5.1 MB/s
1b) Sandisk MicroSD 4GB via card reader over USB 2.0 (Quick bench): 10.7 MB/s