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  1. You might remember my remarkable post regarding testing MS-DOS limitations from almost three years ago and now I'm realising it. Okay, I'm currently running MS-DOS 6.22 triple booting with OS/2 Warp 4 and Windows 95B under GRUB4DOS 0.4.6a 2015-09-15. I'm running Virtual PC 2007 with three 16 GB hard disk images and 256 MB of system memory and have split three of the drives into four partitions. Looking at the Disk Management utility: 1. The areas where it is shaded in dark blue are primary partitions. MS-DOS 6.22 is occupying the first 2 GB on each drive with drive letters C, D and E. 2. The areas where it has a dark green border are extended partitions. 14 GB of disk space on each of the three drives are used as a extended partition. 3. The extended partition on each of the three drives are split into three logical drives. The logical drives are shaded in blue. 4. My OS/2 Warp 4 installation has three 2 GB FAT formatted drives (drives F, I and K mapped as C, D and E) and one 8 GB HPFS formatted partition (drive M mapped as drive F). 5. My Windows 95B installation has three 4 GB FAT32 formatted drive (drives G, J and L mapped as C, D and E). 6. Drive H is a hidden FAT32 formatted drive that will be used as storage. The other 8 GB partition below it will be a Linux formatted partition as I'm going to install DSL 4.4.10 soon. The only problem is that MS-DOS 6.22 lacks INT 13h support which means that it cannot support hard disks larger than 8,025 MB (1,023 cylinders, 255 heads and 63 sectors per track) which means that if the size of the extended partition is over 5,977 MB, MS-DOS will not be able to access any of the three logical drives on each disk at all. Are there any hacks or wokrarounds to overcome the 8,025 MB limit without having to mess-up the GRUB4DOS bootloader?
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