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:
[EMAIL PROTECTED]:/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, [EMAIL PROTECTED]
The technology that is
Stronger, better, faster: Linux
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