On Fri, 2010-04-02 at 20:17 +0000, Andre Robatino wrote: ... > ls -lh dummy-file > > instead shows a size of 700M. Should the test use -l instead of -s? "ls -s" queries the total number of blocks used by a file, which includes overhead (e.g. blocks used to record which blocks store the actual file data). This is why your file that contains exactly 700 * 1024 * 1024 bytes of data (2048 * 358400 bytes = 1433600 512-byte blocks) actually uses 1433608 blocks in the (ext3) filesystem. Try "stat dummy-file" to see a little more data: File: `dummy-file' Size: 734003200 Blocks: 1433608 IO Block: 4096 regular file Device: fd00h/64768d Inode: 97819 Links: 1 Access: (0664/-rw-rw-r--) Uid: ( 501/ ryniker) Gid: ( 501/ ryniker) Access: 2010-04-06 14:45:02.284645705 -0400 Modify: 2010-04-06 14:45:04.939645516 -0400 Change: 2010-04-06 14:45:04.939645516 -0400 Generally, an 80-minute, 700 MB CD actually holds 737,280,000 bytes, a little more than 703 MB. However, there is overhead for the CD filesystem (likely different from the ext3 data displayed above by the stat command). This overhead is included as part of the data in a disc image (.iso) file. One might think a disc_image.iso file no larger than 737280000 bytes is OK, but there are other format requirements that reduce the effective capacity of a 737280000 byte CD to 736970752 bytes (reported by the wodim command). Still, that is about 702.83 MB. Therefore, the "test" should be pretty accurate if it compares the length reported by "ls -l disc_image.iso" with 736970752. Larger than that, the disc image will not fit on a "700 MB" CD without extraordinary measures, such as the wodim -overburn parameter, which probably invites device and media problems. -- test mailing list test@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe: https://admin.fedoraproject.org/mailman/listinfo/test
