hi... is there a chance it could work with any sector size, so that it doesn't
have to be modified when things change again latrer? that could be extremely
useful, since worm drives have 512, 1024 byte sectors, Advanced Format drives
have 4096 byte sectors, and drive manufacturers are likely to increase this
value as time goes on. so having something that can handle a variable number of
sectors would be best.
in fact, I wish djgpp could be redone too if it has those same limitations...
this is a very nice Christmas present! cool! usb disks! I like this!
>________________________________
> From: Bertho Grandpied <[email protected]>
>To: [email protected]
>Sent: Sunday, December 29, 2013 3:44 PM
>Subject: Re: [Freedos-devel] 4, 096 byte sectors and DOSLFN, UIDE... question
>
>
>
>Bernd Blaauw <bblaauw@ho...> wrote on 2013-12-29 19:44...
>
>
>>Would you be able to test your driver against the ASPI.SYS listed at
>[ http://bootcd.narod.ru/index_e.htm ] ?
>
>Probably not directly. If I read and understand the description at that site
>correctly,
>that seems to be an ASPI driver for ATAPI devices, mostly optical like CD.
>Those
>devices wouls usually have 1024 byte sectors, wouldn't they ? Also, they
>aren't "FAT"
>formatted devices.
>
>In its current state, my driver - actually, more of a proof of concept - will
>only mount FAT partitions
>from (something that behaves as a ) R/W hard disk, with 4096 byte sectors
>(both "physical" and "logical"). There are additional limitations ATM, it will
>only mount 1
>"disk" (partition), which must be a "primary" (defined in the MBR) and reside
>entirely
>within the first 64 Gigabytes of the support. It does not support an "int 13"
>(BIOS) interface
>either, and even the DOS functions are crippled (no IOCTL calls supported...)
>
>None of these limits are fundamental, of course, the reason they exist was to
>hack a
>functional, testable, driver for my external IOMEGA disk enclosure as quickly
>as possible.
>Once searching the web had got me a copy of okdish ASPI documents and SDK
>(Adaptec),
>it was not hard to achieve this goal in 2 or 3 days' work. I do not think I
>deserve praise ;=)
>
>Adding full 32-bit sector numbering (instead of 24 bits now) allowing 16
>tebibyte disks
>is easy and a priority. But the rest - enhanced DOS driver functions, multiple
>partitions
>including secondaries, mixed sector sizes, int 13 BIOS...will have to wait,
>may be forever
>- unless there is going to be strong demand, and then possibly against
>retribution, i.e., not free :(
>
>> The idea is the following, as demonstrated for SCSI/USB/Firewire:
>> 1) load a DOS floppy image in memory while hiding all drives (Syslinux/Grub)
>> 2) load driver for mass storage controller (SCSIMGR$)
>> 3) load driver for disks (ASPIDISK.SYS)
>> 4) get access to the recognised partitions/filesystems
>> (preferably including int13)
>
>IIRC someone on this list, Eric Auer possibly? opined int 13 not to be such "a
>must".
>I like "KISS" where possible and BTW the "minimal" driver I have now for all
>its limitations
>is under 1 kilobyte resident. So, being lazy does bring instant reward, too !
>
>To be fair, the real hard work, i.e. the USB protocol "stack" is done not by
>this ASPIDISK thing,
>but by USBASPI !
>
>--
>Czerno
>
>
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