On Monday 11 June 2012, David Brown wrote:
4MB variant: == 2 == 4MiB 4.05M/s 2MiB 6.13M/s 1MiB 6.19M/s 512KiB 6.14M/s 256KiB 5.27M/s 128KiB 4.59M/s 64KiB 6M/s 32KiB 5.04M/s 16KiB 490K/s == 3 == 4MiB 5.06M/s 2MiB 3.93M/s 1MiB 1.72M/s 512KiB 1.51M/s 256KiB 449K/s 128KiB 206K/s 64KiB 1.2M/s 32KiB 1.23M/s 16KiB 1.66M/s == 30 == 4MiB 6.66M/s 2MiB 3.29M/s 1MiB 1.64M/s 512KiB 821K/s 256KiB 408K/s 128KiB 204K/s 64KiB 104K/s 32KiB 149K/s 16KiB 660K/s
Ok, thank you very much!
This confirms that it is the same as my 8 GB essential card, and I would not recommend using this kind of card in production systems with an ext4 or similar file system.
From what I can tell, all the good Samsung cards are marked "Made in Korea" while all the bad ones are "Made in Taiwan". I would not treat this as 100% reliable information as those things tend to change over time, but it's certainly a good indication.
Arnd