Stuart Henderson [EMAIL PROTECTED] wrote: > On 2008-05-23, Marco <[EMAIL PROTECTED]> wrote: > > My SSD 1 GB work very slow. > > > > /mnt/cdrom/tmp $ dd if=/dev/zero of=file.test count=1000 > > dd's default block size is not aligned with block sizes on the flash > eeprom, so you do a lot of unnecessary rewriting. Increase bs= from the > default 512 bytes and it should be faster. > > Current generations of Flash storage devices are not too good at > sustained sequential access like dd will give, especially for writes. > Flash is useful in some situations but has strengths and weaknesses.
Stuart is modest. Aside from increasing block size, which will help you, you should also be using OpenBSD 4.3 or current. Stuart committed a change to OpenBSD for 4.3 which will greatly increase speed on 1-sector IO devices. Your Transcend card supports UltraDMA but OpenBSD may not use it until you upgrade.
