For more informations about this format see microSD on Wikipedia.
A list of supported cards can be found at Supported microSD cards.
Importent note: Wear-leveling and ECC error correction and detection is not part of the SD card specification (version 2.0 SDHC), so please check for yourself that the SD(HC)-card support and use:
- built-in ECC error correction and detection
- Wear Leveling technology
If the manufacturer advertises the card with e.g. 1,000,000 hours MTBF, it might be a strong indication that the above features are used.
Other importent specifications are:
- Low power consumption
- Number of insertions the card endures - 10,000 seems to be good quality.
- Total I/O operations per second
- 2/17/2008, notebookreview.com: SDHC Cards vs Hard Drive vs SSD Quote: "...That sounds like an absolutely manditory thing to have in flash storage ... and luckily "high-performance" SDHC cards such as the 16GB A-DATA SDHC card and many other class 6 cards from other manufacturers incorportate wear-leveling [Please check before you buy!]..."
- MicroSD(HC) cards are a sort of a SSD: December 7, 2008, robert.penz.name: No SWAP Partition, Journaling Filesystems, … on a SSD? Quote: "...They assume perfect wear leveling...We stay also with the 2 million cycles and assume a 16GB SSD *With 50 MByte/sec we get 20 years! *With 2 MByte/sec we get 519 years! *And even if we reduce the write cycles to 100.000 and write with 2 MByte/sec all the time we’re at 26 years!!...1. Never choose to use a journaling file system on the SSD partitions: Bullshit, you’re just risking data security. Stay with ext3...7. One more thing to consider is that flash-devices handle their space in blocks. The blocksize typically varies between 16KB and 512 KB. Therefore writing one byte may cause erase and rewrite of up to 512KB..."
- Please note: SDHC-cards test - not MicroSDHC-cards: tomshardware.com: SDHC Memory Card Charts > File Server Benchmark Pattern: File Server Benchmark Pattern Quote: "...IOMeter 2003.05.10 (Total I/O operations per second for Queuedepth 1 - 64)...", All SDHC Memory Card Charts
- 2008 (geeks) Flash wear leveling Quote: "...We tested several file systems (ext2/3, xfs, reiserfs, FAT, ...) and finaly gave up...and developed an application speciffic log structured file system in userland..."
- MicroSD(HC) can be tested via a USB flash adaptor and H2testw. Please backup your data before testing: September 2, 2008, sosfakeflash.wordpress.com: H2testw 1.4 – Gold Standard In Detecting USB Counterfeit Drives, bloggersbase.com: H2testw - Fix Your USB!, H2testw 1.4