On Mon, 2006-12-04 at 17:06 -0500, T wrote: > On Mon, 04 Dec 2006 15:06:08 -0500, Greg Folkert wrote: > > > On Sun, 2006-12-03 at 21:14 -0800, Carl Johnson wrote: > >> > > >> > I just created a FAT32 partition using Win2k at /dev/sda16. > >> > > >> > But when I tried to mount it under Linux, I get: > >> > > >> > % mount /dev/sda16 /mnt/tmp1/ > >> > mount: special device /dev/sda16 does not exist > >> > > >> > why the device not exist? [...] > >> > >> If you look at the device numbers for sda16 and sdb under linux I > >> think you will see why. [...] > > 1st of all, thank you both for the reply. > > I'm using Testing (kernel 2.6.17 + udev), I don't see /dev/sdb in my > system. > > > It is part of the SCSI Standard. Even if it is an SATA drive which is an > > IDE drive in Windows, partition 16 is actually partition 0 on the next > > drive. > > Both of you has hinted that sda16 should have device numbers as sdb. So I > gave it a try, as follows: > > $ ls -l /dev/sda /dev/sda1* > brw-rw---- 1 root disk 8, 0 12-04 09:28 /dev/sda > brw-rw---- 1 root disk 8, 1 12-04 09:28 /dev/sda1 > brw-rw---- 1 root disk 8, 10 12-04 14:28 /dev/sda10 > brw-rw---- 1 root disk 8, 11 12-04 14:28 /dev/sda11 > brw-rw---- 1 root disk 8, 12 12-04 09:28 /dev/sda12 > brw-rw---- 1 root disk 8, 13 12-04 14:28 /dev/sda13 > brw-rw---- 1 root disk 8, 14 12-04 14:29 /dev/sda14 > brw-rw---- 1 root disk 8, 15 12-04 14:29 /dev/sda15 > brw-rw---- 1 root disk 9, 0 12-04 16:49 /dev/sda16 > ^^^^^ > > But that does not work: > > $ mount /dev/sda16 /mnt/tmp1/ > mount: /dev/sda16: can't read superblock > > So is there any workaround so that I can access it? How come my Win2k can > accesse the sda16 without any problem? Because it uses IDE drives to access the drive. IDE allows 64 partitions. SATA using "libsata" is classified as a SCSI device. SCSI dunnah work past a minor 15. And "9,0 block" is not sdb it is /dev/md0. "8,16 block" is sdb, according to the Major and Minor number references I find (see further down in the message) Here is my example of my 2 SATA and 2 "USB-Storage" drive setup everything automagically setup using udev and hotplug: greg@princess:/dev$ ls -l sd* brw-rw---- 1 root disk 8, 0 2006-11-27 19:45 sda brw-rw---- 1 root disk 8, 1 2006-11-27 19:45 sda1 brw-rw---- 1 root disk 8, 16 2006-11-27 19:45 sdb brw-rw---- 1 root disk 8, 17 2006-11-27 19:45 sdb1 brw-rw---- 1 root floppy 8, 32 2006-12-06 08:10 sdc brw-rw---- 1 root floppy 8, 33 2006-12-06 08:10 sdc1 brw-rw---- 1 root floppy 8, 34 2006-12-06 08:10 sdc2 brw-rw---- 1 root floppy 8, 48 2006-12-06 08:10 sdd As you can see the minor numbers are as follows: sda = 0 ( 1 - 15 usable for partions 1-15) sda = 0 sda1 = 1 sda2 = 2 sda3 = 3 sda4 = 4 sda5 = 5 sda6 = 6 sda7 = 7 sda8 = 8 sda9 = 9 sda10 = 10 sda11 = 11 sda12 = 12 sda13 = 13 sda14 = 14 sda15 = 15 sdb = 16 ( 17 - 31 usable for partions 1-15) sdb = 16 sdb1 = 17 sdb2 = 18 sdb3 = 19 sdb4 = 20 sdb5 = 21 sdb6 = 22 sdb7 = 23 sdb8 = 24 sdb9 = 25 sdb10 = 26 sdb11 = 27 sdb12 = 28 sdb13 = 29 sdb14 = 30 sdb15 = 31 sdc = 32 ( 33 - 47 usable for partions 1-15) sdc = 32 sdc1 = 33 sdc2 = 34 sdc3 = 35 sdc4 = 36 sdc5 = 37 sdc6 = 38 sdc7 = 39 sdc8 = 40 sdc9 = 41 sdc10 = 42 sdc11 = 43 sdc12 = 44 sdc13 = 45 sdc14 = 46 sdc15 = 47 sdd = 48 ( 49 - 63 usable for partions 1-15) sdd = 48 sdd1 = 49 sdd2 = 50 sdd3 = 51 sdd4 = 52 sdd5 = 53 sdd6 = 54 sdd7 = 55 sdd8 = 56 sdd9 = 57 sdd10 = 58 sdd11 = 59 sdd12 = 60 sdd13 = 61 sdd14 = 62 sdd15 = 63 sde = 64 ( 65 - 79 usable for partions 1-15) sde = 64 sde1 = 65 sde2 = 66 sde3 = 67 sde4 = 68 sde5 = 69 sde6 = 70 sde7 = 71 sde8 = 72 sde9 = 73 sde10 = 74 sde11 = 75 sde12 = 76 sde13 = 77 sde14 = 78 sde15 = 79 sdf = 80 ( 81 - 95 usable for partions 1-15) sdf = 80 sdf1 = 81 sdf2 = 82 sdf3 = 83 sdf4 = 84 sdf5 = 85 sdf6 = 86 sdf7 = 87 sdf8 = 88 sdf9 = 89 sdf10 = 90 sdf11 = 91 sdf12 = 92 sdf13 = 93 sdf14 = 94 sdf15 = 95 sdg = 96 ( 97 - 111 usable for partions 1-15) sdg = 96 sdg1 = 97 sdg2 = 98 sdg3 = 98 sdg4 = 100 sdg5 = 101 sdg6 = 102 sdg7 = 103 sdg8 = 104 sdg9 = 105 sdg10 = 106 sdg11 = 107 sdg12 = 108 sdg13 = 108 sdg14 = 110 sdg15 = 111 sdh = 112 (113 - 127 usable for partions 1-15) sdh = 112 sdh1 = 113 sdh2 = 114 sdh3 = 115 sdh4 = 116 sdh5 = 117 sdh6 = 118 sdh7 = 119 sdh8 = 120 sdh9 = 121 sdh10 = 122 sdh11 = 123 sdh12 = 124 sdh13 = 125 sdh14 = 126 sdh15 = 127 sdi = 128 (129 - 143 usable for partions 1-15) sdi = 128 sdi1 = 129 sdi2 = 130 sdi3 = 131 sdi4 = 132 sdi5 = 133 sdi6 = 134 sdi7 = 135 sdi8 = 136 sdi9 = 137 sdi10 = 138 sdi11 = 139 sdi12 = 140 sdi13 = 141 sdi14 = 142 sdi15 = 143 sdj = 144 (145 - 159 usable for partions 1-15) sdj = 144 sdj1 = 145 sdj2 = 146 sdj3 = 147 sdj4 = 148 sdj5 = 149 sdj6 = 150 sdj7 = 151 sdj8 = 152 sdj9 = 153 sdj10 = 154 sdj11 = 155 sdj12 = 156 sdj13 = 157 sdj14 = 158 sdj15 = 159 sdk = 160 (162 - 175 usable for partions 1-15) sdk = 160 sdk1 = 161 sdk2 = 162 sdk3 = 163 sdk4 = 164 sdk5 = 165 sdk6 = 166 sdk7 = 167 sdk8 = 168 sdk9 = 169 sdk10 = 170 sdk11 = 171 sdk12 = 172 sdk13 = 173 sdk14 = 174 sdk15 = 175 sdl = 176 (177 - 191 usable for partions 1-15) sdl = 176 sdl1 = 177 sdl2 = 178 sdl3 = 179 sdl4 = 180 sdl5 = 181 sdl6 = 182 sdl7 = 183 sdl8 = 184 sdl9 = 185 sdl10 = 186 sdl11 = 187 sdl12 = 188 sdl13 = 189 sdl14 = 190 sdl15 = 191 sdm = 192 (193 - 207 usable for partions 1-15) sdm = 192 sdm1 = 193 sdm2 = 194 sdm3 = 195 sdm4 = 196 sdm5 = 197 sdm6 = 198 sdm7 = 199 sdm8 = 200 sdm9 = 201 sdm10 = 202 sdm11 = 203 sdm12 = 204 sdm13 = 205 sdm14 = 206 sdm15 = 207 sdn = 208 (209 - 223 usable for partions 1-15) sdn = 208 sdn1 = 209 sdn2 = 210 sdn3 = 211 sdn4 = 212 sdn5 = 213 sdn6 = 214 sdn7 = 215 sdn8 = 216 sdn9 = 217 sdn10 = 218 sdn11 = 219 sdn12 = 220 sdn13 = 221 sdn14 = 222 sdn15 = 223 sdo = 224 (223 - 239 usable for partions 1-15) sdo = 224 sda1 = 225 sdo2 = 226 sda3 = 227 sdo4 = 228 sda5 = 229 sdo6 = 230 sda7 = 231 sdo8 = 232 sda9 = 233 sdo10 = 234 sda11 = 235 sdo12 = 236 sda13 = 237 sdo14 = 238 sda15 = 239 sdp = 240 (241 - 255 usable for partions 1-15) sdp = 240 sdp1 = 241 sdp2 = 242 sdp3 = 243 sdp4 = 244 sdp5 = 245 sdp6 = 246 sdp7 = 247 sdp8 = 248 sdp9 = 249 sdp10 = 250 sdp11 = 251 sdp12 = 252 sdp13 = 253 sdp14 = 254 sdp15 = 255 Applying the above info to the info below should give you a clue as to the complexity of defining devices. Past /dev/sdp is Major 65 block device or /dev/sdq --> /dev/sdaf Past /dev/sdaf is Major 66 block device or /dev/sdag --> /dev/sdav Past /dev/sdav is Major 67 block device or /dev/sdaw --> /dev/sdbl Past /dev/sdbl is Major 68 block device or /dev/sdam --> /dev/sdcb Past /dev/sdcb is Major 69 block device or /dev/sdcc --> /dev/sdcr Past /dev/sdcr is Major 70 block device or /dev/sdcs --> /dev/sddh Past /dev/sddh is Major 71 block device or /dev/sddi --> /dev/sddx Past /dev/sddx is Major 128 block device or /dev/sddy --> /dev/sden Past /dev/sden is Major 129 block device or /dev/sdeo --> /dev/sdfd Past /dev/sdfd is Major 130 block device or /dev/sdfe --> /dev/sdft Past /dev/sdft is Major 131 block device or /dev/sdfu --> /dev/sdgj Past /dev/sdgj is Major 132 block device or /dev/sdgk --> /dev/sdgz Past /dev/sdgz is Major 133 block device or /dev/sdha --> /dev/sdhp Past /dev/sdhp is Major 134 block device or /dev/sdhq --> /dev/sdif Past /dev/sdif is Major 135 block device or /dev/sdig --> /dev/sdiv For a total of 255 SCSI Disk Drives in direct control of the kernel. Each with upto 15 usable partitions gives you a possibility of 3825 device files for SCSI Drives only. On the IDE stuff: major 3 block = hda (minor 0-63) and hdb (64-127) Minor numbers for /dev/hda hda = 0 hda1 = 1 hda2 = 2 hda3 = 3 hda4 = 4 hda5 = 5 hda6 = 6 hda7 = 7 hda8 = 8 hda9 = 9 hda10 = 10 hda11 = 11 hda12 = 12 hda13 = 13 hda14 = 14 hda15 = 15 hda16 = 16 hda17 = 17 hda18 = 18 hda19 = 19 hda20 = 20 hda21 = 21 hda22 = 22 hda23 = 23 hda24 = 24 hda25 = 25 hda26 = 26 hda27 = 27 hda28 = 28 hda29 = 29 hda30 = 30 hda31 = 31 hda32 = 32 hda33 = 33 hda34 = 34 hda35 = 35 hda36 = 36 hda37 = 37 hda38 = 38 hda39 = 39 hda40 = 40 hda41 = 41 hda42 = 42 hda43 = 43 hda44 = 44 hda45 = 45 hda46 = 46 hda47 = 47 hda48 = 48 hda49 = 49 hda50 = 50 hda51 = 51 hda52 = 52 hda53 = 53 hda54 = 54 hda55 = 55 hda56 = 56 hda57 = 57 hda58 = 58 hda59 = 59 hda60 = 60 hda61 = 61 hda62 = 62 hda63 = 63 Minor numbers for /dev/hdb hdb = 64 hdb1 = 65 hdb2 = 66 hdb3 = 67 hdb4 = 68 hdb5 = 69 hdb6 = 70 hdb7 = 71 hdb8 = 72 hdb9 = 73 hdb10 = 74 hdb11 = 75 hdb12 = 76 hdb13 = 77 hdb14 = 78 hdb15 = 79 hdb16 = 80 hdb17 = 81 hdb18 = 82 hdb19 = 83 hdb20 = 84 hdb21 = 85 hdb22 = 86 hdb23 = 87 hdb24 = 88 hdb25 = 89 hdb26 = 90 hdb27 = 91 hdb28 = 92 hdb29 = 93 hdb30 = 94 hdb31 = 95 hdb32 = 96 hdb33 = 97 hdb34 = 98 hdb35 = 99 hdb36 = 100 hdb37 = 101 hdb38 = 102 hdb39 = 103 hdb40 = 104 hdb41 = 105 hdb42 = 106 hdb43 = 107 hdb44 = 108 hdb45 = 109 hdb46 = 110 hdb47 = 111 hdb48 = 112 hdb49 = 113 hdb50 = 114 hdb51 = 115 hdb52 = 116 hdb53 = 117 hdb54 = 118 hdb55 = 119 hdb56 = 120 hdb57 = 121 hdb58 = 122 hdb59 = 123 hdb60 = 124 hdb61 = 125 hdb62 = 126 hdb63 = 127 Please apply above logic to the listings below: major 22 block = hdc (minor 0-63) and hdd (64-127) major 33 block = hde (minor 0-63) and hdf (64-127) major 34 block = hdg (minor 0-63) and hdh (64-127) major 56 block = hdi (minor 0-63) and hdj (64-127) major 57 block = hdk (minor 0-63) and hdl (64-127) major 88 block = hdm (minor 0-63) and hdn (64-127) major 89 block = hdo (minor 0-63) and hdp (64-127) major 90 block = hdq (minor 0-63) and hdr (64-127) major 91 block = hds (minor 0-63) and hdt (64-127) For a total of 10 IDE controllers and 2 drives posible per channel. 20 drives with 63 usable partitions different partitons gives 1260 devices files for IDE Drives only (but not SATA drives which are classified as SCSI in Linux) Reference for Major and Minor, Block and Character mode devices: http://www.lanana.org/docs/device-list/devices-2.6+.txt Search for "8 block" and read Then search for "9 block" (or just scroll down) is for /dev/md* setups So the lesson here, is one I learned about 12 years ago: Allocate the whole disk in 15 partitions. Period. I know, it sucks. But Dual booting taught me that, years ago. I also learned that Novell's Netware (through Netware 6 that I know of) only allows 8 partitions per disk using traditional disk management (not NSS)... if you don't use it up in 8 you lose it, unless you remove all data and re-partition. For the record, now that I am using HUGE drives(300GB+), I use LVM or EVMS to manage allocations. I know Windows doesn't know how to use LVM or EVMS. I don't use Windows anymore except in a Virtual machine and I can't remember the last time I even booted it. -- greg, greg@gregfolkert.net The technology that is Stronger, better, faster: Linux
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