The Silicon Power 32GB Class 10 SDHC was packaged using the typical Blister Pack. This protects it from moisture along with holding it in place during shipping. While this packaging is extremely hard to get into, it prevents damage and theft while in a store. While the packaging looks like the packaging of a generic card we are sure that it is like wrapping a Ferrari in Christmas Style Wrapping Paper on Halloween. Reguardless, we would like to see something that costs as much as this does draw a little more attention while still in the packaging.
A Closer Look
What the Classes Mean
The Speed Class Rating is the official unit of speed measurement for SD Cards, defined by the SD Association. It is equal to 1 MB/s (8 Mbit/s), and it measures the minimum sustained write speeds for a fragmented state
The following are the ratings of some currently available cards:
- Class 2: 2 MB/s
- Class 4: 4 MB/s
- Class 6: 6 MB/s
- Class 10: 10 MB/s
Even though the class ratings are defined by a governing body, like × speed ratings, class speed ratings are quoted by the manufacturers but unverified by any independent evaluation process. In applications that require sustained write throughput, such as video recording, the device may not perform satisfactorily if the SD card’s class rating falls below a particular speed. For example, a camcorder that is designed to record to class 6 media may suffer dropouts or corrupted video on slower media.
Important differences between the Speed Class and the traditional CD-ROM drive speed measurement (“×” speed ratings) are that speed class:
- may be queried by the host device
- defines the minimum transfer speed.
Since the class rating is readable by devices, they can issue a warning to the user if the inserted card’s reported rating falls below the application’s minimum requirement.
The Card Itself