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...it's just that the 512MB + 4k write will cause some random block to disappear). But the other part is that there isn't a good single metric for "crash safety" (crash safety against head-on collisions? crash safety versus side impact collisions? etc.) Similarly, even for a non-fradulent USB stick or SD card, there is no single way to measure "FTL quality". An FTL which is optimized for use in digital cameras (where writes are usually sequential, and for large jpg images) may be horrible for use a general purpose root file system. There are sites that will do technic...

> We'd like to help in software, but we can't; we have no reliable way > of knowing most of the necessary details of this class of hardware. > It's not exported in any way. > > So unfortunately we are as in the dark as you are in this case. This is incredible, Mr Sandeen. You mean USB flash manufacturers (what's their body - the USB Implementer's Forum?) have

On 8/29/13 10:46 AM, Theodore Ts'o wrote: > So this is fundamentally a problem with the quality of the hardware, > and that's not something the file system can really compensate for. > And there's no way to tell whether a particular USB device has has a > high quality flash device, or is a craptastic flash device. It's not > like we can query the device for "I

...ufacturers. Or that it is by neglect on their part, or lazyness, or some other cause of a fissure in industry relations. Whatever the reason, it raises another question, and that is what must be done so that I can simply format my USB without a concern and get back to my work. > even for a non-fradulent USB stick or SD card, there is no single way to measure "FTL quality". ... there are some things (such as the erase block size) which would be useful for tuning file system performance. And the technical people I've talked to at various Flash manufacturers all agree it's poin...