Messages in this thread | | | Date | Thu, 16 Sep 99 13:34:21 +0200 | From | Erik Mouw <> | Subject | Re: ext2 file sizes |
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On Wed, 15 Sep 1999 15:17:47 -0400 (EDT), Richard B. Johnson wrote: > What on earth are you doing with a single _file_ of that size? If you > need a gob of storage for data acquisition, you might be better off > with a dedicated raw device. Since you access it in blocks, rather than > bytes, you won't have a size limitation for a few more years.
Recording studio quality uncompressed digital video (CCIR 601: 720x576@25Hz YUV 4:2:2; ~20 Mbyte per second[1]) for example. One minute of video already uses ~1.2 Gbyte. It's much easier to record it to a normal filesystem[2] instead of a raw device: you can use the standard libc file functions to manipulate the data.
Erik
[1] 720 pixels horizontal x 576 pixels vertical x 2 bytes per pixel + 6144 bytes padding to get to the nearest multiple of 16 kbyte (for performance reasons) = 835584 bytes per frame. [2] Although you can hardly call SGI IRIX XFS with real-time partitions and guaranteed rate I/O a "normal filesystem".
-- J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department of Electrical Engineering, Faculty of Information Technology and Systems, Delft University of Technology, PO BOX 5031, 2600 GA Delft, The Netherlands Phone: +31-15-2785859 Fax: +31-15-2781843 Email J.A.K.Mouw@its.tudelft.nl WWW: http://www-ict.its.tudelft.nl/~erik/
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