I've found that some software refuses to run on removables. They warn you that the media is removable but on Komputer Bay chips they run well.
cheers DS On Mon, 26 Oct 2020 22:31:53 +0000 "Deposite Pirate" <dpir...@metalpunks.info> writes: > October 26, 2020 10:10 PM, "Bret Johnson" <bretj...@juno.com > (mailto:bretj...@juno.com?to=%22Bret%20Johnson%22%20<bretj...@juno.com>)> > wrote: > The problem I have found in writing disk drivers in the past (like > my USB drivers) are the disks that do NOT show themselves as > removable when they actually are, not the ones (like SanDisk) that > show reality. If a disk says it is not removable it means you should > NEVER need to worry about somebody removing it and replacing it with > something different. That is never the case with CF media. Even > though the SATA controller may not be removable, the CF cards are > and they should be treated as such. SATA is designed for use with > removable media. > > I'm not sure about SATA, but at least with floppies and USB the > hardware doesn't have a disk eject sensor so you need to mange the > potential media changes with software. At least on floppies, this is > normally done with a timer and if the disk hasn't been accessed for > more than a few seconds when the OS asks the driver if the disk has > changed the driver must respond with "I don't know" (which DOS must > effectively treat as a "yes"). Of course, this decreases throughput > speed since DOS must read the first part of the disk (boot sector, > BIOS Parameter Block, FAT, etc.) to try and decide if the media has > really changed or not instead of just relying on what's in the cache > from the last access. You can also continually poll the disk (every > few seconds) and then you can definitively tell DOS "yes" or "no", > but that uses power so may not be a good idea on something running > off batteries (like a laptop). > > Bottom line is that the SanDisk CF cards are they way they should be > even though some computers may have a problem with them. In > addition, I believe SATA drivers should always (at least by default) > assume removable media unless you can verify they have a hardware > media change sensor. > Some OSes like (unsurprisingly) Windows >= XP and Haiku won't > install or run properly on a CF card whose removable bit is set for > absolutely no good reason. If you manage to flip the bit to off it > will just treat it as a hard disk and then everything works as it > should. Sandisk used to have a dos tool to do just that for their CF > cards. But they silently withdrew it so they could sell so-called > "industrial" CF cards that have that bit set to off for twice to > thrice the price. Linux, *BSD, DOS do not give a rat's ass whether a > CF card has the removable bit flipped or not. They will install and > run with no problem. Which is how it should be. Linux doesn't check > whether a CF card is removable or not because it is the > responsibility of the user to know not to jack out the CF card when > they are using it as a hard drive. Just like you don't remove a live > CD when you're installing from it or when you run some OS from > floppies. ******************************************************>>>> >From Dale Sterner - MS organic chemistry http://pubs.acs.org/doi/abs/10.1021/jo00975a052 *******************************************************>>>> ____________________________________________________________ Sponsored by https://www.newser.com/?utm_source=part&utm_medium=uol&utm_campaign=rss_taglines_more Why a Wisconsin Poll Is Getting So Much Attention http://thirdpartyoffers.juno.com/TGL3141/5f99dae3717d35ae350cbst03duc1 Black Teen Was Alive When Covered by Blanket: Girlfriend http://thirdpartyoffers.juno.com/TGL3141/5f99dae3911855ae350cbst03duc2 He Told Sisters to Wear Masks. He Was Stabbed 27 Times http://thirdpartyoffers.juno.com/TGL3141/5f99dae3b21a95ae350cbst03duc3 _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
