For those who would like the procedure for building an Elf/OS filesystem on a card larger than 268mb, here it is. I am going to show how to build a 250mb Elf/OS disk, if this size is fine for you then you can use the numbers I will compute here, otherwise just use the technique I show here to figure out how to build a filesystem of the size you want. Note that during installation you will never use option 1. (HDINIT), we are going to do manually what HDINIT would do, but using our own defined sector count instead of what the CF card reports. First need to find the number of sectors. so, 250,000,000 / 512 (bytes per sector) = 488,281 sectors. Now convert this number to hex and you get: 00077359. This is the number you will need for SEDIT What follows now is a terminal trace where I used this number to install Elf/OS onto a blank disk. One quick note during step 2 (FSGEN) it shows a number of sectors and a number of AUs. The sector count is only the bottom 16 bits of the sector count, so from my example size the bottom 16 bits is 7359, which in decimal is 29529, you will know that SEDIT properly wrote sector 0 and that FSGEN correctly read sector 0 if the sector count it shows is the correct number, 29529 in my example. The AU count is based upon the full 32-bit sector count and to compute how many AUs should be showing, take the sector count divided by 8, in in my example 488,281 / 8 = 61,035. So I expect to see an AU count of 61,035. I will put in bold the parts you type. note that means to press the ENTER key. If the sectors and AU count are not what you expect then you may have an issue with reading/writing the CF card, go back to SEDIT, load sector 0 and check what is at offset 100h. Now for the terminal trace from a fresh boot: >@F000 SEDIT>R0 Current sector: 0000 SEDIT>H 0100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0190: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 01A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 01B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 01C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 01D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 01E0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 01F0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ SEDIT>E100 00 07 73 59 SEDIT>H 0100: 00 07 73 59 00 00 00 00 00 00 00 00 00 00 00 00 ..sY............ 0110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0190: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 01A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 01B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 01C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 01D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 01E0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 01F0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ SEDIT>W Current sector: 0000 SEDIT>Q >@9000 Elf/Os Installation 1> Run hard drive init tool 2> Run filesystem gen tool 3> Run sys tool 4> Install binaries 5> Boot Elf/OS Option ? 2 IDE File System Gen Utility Total Sectors: 29529 AU Size: 8 Total AUs: 61035 Master Dir Sector: 256 File system generation complete Elf/Os Installation 1> Run hard drive init tool 2> Run filesystem gen tool 3> Run sys tool 4> Install binaries 5> Boot Elf/OS Option ? 3 System copied. Elf/Os Installation 1> Run hard drive init tool 2> Run filesystem gen tool 3> Run sys tool 4> Install binaries 5> Boot Elf/OS Option ? 4 Binary utilities installer Install DIR ? Y Installing... Install DUMP ? Y Installing... Install MINIMON ? Y Installing... Install LOAD ? Y Installing... Install FREE ? Y Installing... Install DEL ? Y Installing... Install SAVE ? Y Installing... Install HEXDUMP ? Y Installing... Install COPY ? Y Installing... Install RENAME ? Y Installing... Install TYPE ? Y Installing... Install EDIT ? Y Installing... Install EXEC ? Y Installing... Install RINSTALL ? Y Installing... Install MKDIR ? Y Installing... Install RMDIR ? Y Installing... Install CHDIR ? Y Installing... Install PATCH ? Y Installing... Install VER ? Y Installing... Install ASM ? Y Installing... Install STAT ? Y Installing... Install SEDIT ? Y Installing... Elf/Os Installation 1> Run hard drive init tool 2> Run filesystem gen tool 3> Run sys tool 4> Install binaries 5> Boot Elf/OS Option ? 5 Starting Elf/OS ... Version 0.2.8 Copyright 2004-2007 by Michael H Riley Ready : FREE Total AUs: 61035 Free AUs : 60979 Ready :