Hi, I am reading from LDD3 and in the block device chapter there is a talk about KERNEL_SECTOR_SIZE which is supposed to be 512bytes. The problem is the terminology. A sector is a very big thing, i.e.: in a floppy you have 18 sectors, 2 heads, 80 cylinders and a block size of 512bytes. The size of a sector (which is a slice) is 80 * 512 bytes. http://en.wikipedia.org/wiki/Cylinder-head-sector I am sure this is not what they meant in the kernel. I.e., i think they meant block size. but in the same code they also mention a sector which seems to be referring to the number of sectors:16 (slice). In section 16.2.3 And then they say geo.start = 4 to refer to the starting sector but this time again they probably mean block. This is confusing. Can somebody clear this up? Also, regarding sectors of 2048 bytes (block size) and the kernel works with 512bytes. If your device work in 2048 bytes, do you have to translate each sector (block) to 4 consecutive kernel sectors in the (virtual) array of sectors the kernel sees in your driver? The problem with that is that it would think that a request are not on the same cylinder and won't group it correctly. I.e. 4 virtual kernel cylinders are actually 1 cylinder in the device. 10x. -- Regards, Tzahi. -- Tzahi Fadida Blog: http://tzahi.blogsite.org | Home Site: http://tzahi.webhop.info WARNING TO SPAMMERS: see at http://members.lycos.co.uk/my2nis/spamwarning.html -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
