Henry Vermaak wrote:
The only delay I can see (after fsync) would be due to the hardware
cache of the disk in use (or a defective drive). On linux you can call
hdparm to flush on-disk caches.
But is hdparm fully supported by external Flash cards, and does it
return before or after data is guaranteed to be filly committed?
This is a red herring (sorry, my mistake). Compact flash cards (and
other removable media) are block devices, they have firmware that do
this flash to block emulation. I realise now that Michael meant that
some cf cards have crappy firmware that can't handle power cuts. There
isn't much you can do about that, but choose a good cf card or usb stick.
But there are several different interfaces to Flash storage technology,
CompactFlash (i.e. PCMCIA -> IDE/ATA) is only one of them. Different
considerations probably apply to other MTD devices (in particular SD and
its derivatives), which might make them either more or less vulnerable
to abuse.
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
--
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