Re: [Ql-Users] Copying large files
Il 18/08/2017 10.06, Wolf via Ql-Users ha scritto: So, if a sector number of a file would be higher than 65536, the error is triggered. As each sector is 512 =Bytes long, after 65536 * 512 = 32Mib, it's the end. Thanks you Wolf Andrea ___ QL-Users Mailing List
Re: [Ql-Users] Copying large files
> > > Realistically, I wouldn't go over 2 GiB. > > I would say that this is a size more than enough: -D ___ QL-Users Mailing List
Re: [Ql-Users] Copying large files
Hi, Theoretically, a cluster could contain 65536 sectors. So the qxl.win file could be 65536 x 65536 x 512 bytes big. Realistically, I wouldn't go over 2 GiB. HTH Wolfgang NB there is another 65536 limit in the filesystem, that of the number of clusters a qxl.win drive may have so, the maximun size of a win file is? Giorgio ___ QL-Users Mailing List ___ QL-Users Mailing List
Re: [Ql-Users] Copying large files
On Fri, 18 Aug 2017, at 09:10 AM, Giorgio Garabello via Ql-Users wrote: > > > > > > > > NB there is another 65536 limit in the filesystem, that of the number of > > clusters a qxl.win drive may have > > > > so, the maximun size of a win file is? > <-- this big -> ___ QL-Users Mailing List
Re: [Ql-Users] Copying large files
> > > > NB there is another 65536 limit in the filesystem, that of the number of > clusters a qxl.win drive may have > so, the maximun size of a win file is? Giorgio ___ QL-Users Mailing List
[Ql-Users] Copying large files
Hi all, as promised, I had a look at the problem of copying large files onto a QXL.WIN drive. The answer is simple : if you try to write anything larger than 32 MiB, you'll get an end of file error. This is because, for slave blocks, sector numbers are stored are in a word. Thus, in dev8_dv3_dv3_albf_asm you can read this: dv3_albf cmp.l d3c_feof(a0),d4 ; end of file? blt.s dv3_lcbf ; ... no, locate move.l d3c_fsect(a0),d5 move.l ddf_smask(a4),d3 ; byte within sector and.w d4,d3 bne.s dlb_loc1 ; not the start of a new sector addq.w #1,d5; next sector***! bcc.s dab_do ; ... current version can only cope ; with sector number up to 65535 move.l d4,d5; start of file? beq.s dab_do moveq #0,d5 subq.w #1,d5; highest sector number moveq #err.eof,d0 rts So, if a sector number of a file would be higher than 65536, the error is triggered. As each sector is 512 =Bytes long, after 65536 * 512 = 32Mib, it's the end. To get around this, you would have to rewrite, at least, the parts of the filesystem handling the slave blocks. HTH Wolfgang NB there is another 65536 limit in the filesystem, that of the number of clusters a qxl.win drive may have ___ QL-Users Mailing List
