HD-Mod Guide by PSaN (psan@sverige.nu)

The HD: HD smaller or equal to 8.4gb (See "other info")
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 1. Download Dos 5.0 Boot-disk: http://www.bootdisk.com/bootdisk.htm
 2. Restart computer with the just the hd installed and the bootdisk in.
 3. Start F-Disk and create primary partition.
 4. Don´t allow big HDs.
 5. Start creating your partitions, they should be about 2gb each. (max FAT16 size)
 6. Restart computer and format each drive into FAT32 and name them: D1,D2,D3,D4.

Install Bios
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 7. Download bios: http://n64.icequake.net/mirror/zmod.onestop.net/zbios.htm
 8. Rename the bios image to z64bios.img and copy to a zip.
 9. Install the new bios.
10. Take out your zip-drive and install your HD.

Other info
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11. If u got a 3.5" hd, then u have to take the power from an old computer power supply.
12. To get it too work with a 2.5" hd, just use an adapter from 2.5" to 3.5" (about 7$).
13. U can use two hds at the same time.
    To use a zip and a hd, just set the zip into slave. 
14. This guide should work with bigger HDs than 8.4
    But the Z64 should only be able to read the first 4 partitions.
15. My english sucks ;)
16. I might have missed something, email me about misstakes in the text and spelling errors)

Troubleshooting
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16. If the hd doesn't seem to work, keep the power on (hd), turn of the Z64, wait a minute and turn it on again.
    That was the only problem I had.
17. If the solution above doesn´t help, change HD. 
18. If the solution above doesnät help, check your Z64 with a Zip-drive, if that doesn´t work, u z64 is broken :(
19. IF the above work, I don´t know =)

Disclamer
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20. I just did this guide to be nice, don´t blame me if your Z64 doesn´t work after attempting this mod!!

Credits
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Milo, Dextrose, bootdisk.com, z64.com