What is the size limit for QNX4 and QNX6 Hard disk?


I’d like to use too large hard disk(about 500GB~1TB).

Then, is it possible to use QNX4 and QNX6?

If… it has limit…

What is the size limit for QNX4 and QNX6 Hard disk?

Thank you and Good luck.

I don’t think the file system will have any trouble with the 500GB disk. A driver problem is always a possibility, however there seemed to be a limit at 120GB that has been overcome, so I wouldn’t think there would be another problem till at least 1.6Terabyte.

Keep in mind however that the file system only supports individual files up to 4Gig.


  • you have to use Fsys -Hdisk500 if you want to use 500GB disk
    if you want to use 3x 500GB disk then you have to use Fsys -Hdisk1500, and so on…
    we usually add some to make sure (eg: for 2x 120GB we use -Hdisk260)
  • max file size is 2GB

i dont know about qnx6

Under QNX4 I beleive you also need to use Fsys.atapi with the lba48 option.

QNX4/6 filesystem can support maximum partition size of 1 099 511 627 776 bytes (~ 1Tb) if QSS boys use signed index in structures. if they use unsigned int’s in index fields, then you can create up to 2Tb partitions.
So the limitations can appear in driver too.
Maximum file size is 2Gb. :frowning: