November 19, 201114 yr Hello all, I just recently purchased and installed a new jumpered WD 2TB EARS drive in my unRAID server, to go with two other jumpered WD 2TB EARS drives that I already had in my server. I just ran the preclear, but I did it with the "-a" option. It started at sector 64, but I think I needed to start at 63. Did I do the right thing or should I go back and rerun the preclear with a different option or no option? Thanks in advance for your assistance! Mod edit: Marked thread [sOLVED]. - Raj
November 19, 201114 yr Hello all, I just recently purchased and installed a new jumpered WD 2TB EARS drive in my unRAID server, to go with two other jumpered WD 2TB EARS drives that I already had in my server. I just ran the preclear, but I did it with the "-a" option. It started at sector 64, but I think I needed to start at 63. Did I do the right thing or should I go back and rerun the preclear with a different option or no option? Thanks in advance for your assistance! if you user -a, you would have specified sector 63. if -A, sector 64. If jumpered you want sector 63. you can use preclear_disk.sh -t /dev/sdX to see if (and how) they are set. If they are precleared, you can use preclear_disk.sh -C 64 /dev/sdX or preclear_disk.sh -C 63 /dev/sdX to convert from one to the other.. (as long as you did not yet assign them to the array just yet)
November 19, 201114 yr Author if you user -a, you would have specified sector 63. if -A, sector 64. If jumpered you want sector 63. you can use preclear_disk.sh -t /dev/sdX to see if (and how) they are set. If they are precleared, you can use preclear_disk.sh -C 64 /dev/sdX or preclear_disk.sh -C 63 /dev/sdX to convert from one to the other.. (as long as you did not yet assign them to the array just yet) Awesome. Looks like I used "-A" because it was set to sector 64. But the other two disks have been assigned to my array since last year and I can't tell what sector they are since they are assigned. The reports I saved from last year don't have what sector they started on. I followed the procedures from last year when preclearing a jumpered drive, so I believe they start on sector 63. Should I got ahead and change the new drive to sector 63 and then add it to the array? Any risks?
November 19, 201114 yr There are no risks to using the "-C" option on a drive not yet installed in the array after being pre-cleared. It only take s a few seconds to run. It will not run unless there is an existing pre-clear signature on the disk. If the other two drives are assigned to your array and are jumpered, then just leave them as they are. You can tell their current partitioning by typing: fdisk -lu /dev/sdX
November 19, 201114 yr Author Looks like I should be okay then. Thanks for all of your help! root@unRAID:/boot# preclear_disk.sh -t /dev/sdc Pre-Clear unRAID Disk /dev/sdc ################################################################## 1.13 Device Model: WDC WD20EARS-60MVWB0 Serial Number: WD-WCAZA8305788 Firmware Version: 51.0AB51 User Capacity: 2,000,398,934,016 bytes Disk /dev/sdc: 2000.3 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/sdc1 64 3907029167 1953514552 0 Empty Partition 1 does not end on cylinder boundary. ######################################################################## ========================================================================1.13 == == DISK /dev/sdc IS PRECLEARED with a starting sector of 64 == ============================================================================ root@unRAID:/boot# preclear_disk.sh -C 63 /dev/sdc Pre-Clear unRAID Disk /dev/sdc ################################################################## 1.13 Device Model: WDC WD20EARS-60MVWB0 Serial Number: WD-WCAZA8305788 Firmware Version: 51.0AB51 User Capacity: 2,000,398,934,016 bytes ######################################################################## Converting existing pre-cleared disk to start partition on sector 63 ========================================================================1.13 Step 1. Verifying existing pre-clear signature prior to conversion. DONE Step 2. converting existing pre-clear signature: DONE ========================================================================1.13 == == Conversion complete. == DISK /dev/sdc is now PRECLEARED with a starting sector of 63 == ============================================================================ root@unRAID:/boot# fdisk -lu /dev/sda Disk /dev/sda: 2000.3 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/sda1 63 3907029167 1953514552+ 0 Empty Partition 1 does not end on cylinder boundary. root@unRAID:/boot# fdisk -lu /dev/sdb Disk /dev/sdb: 2000.3 GB, 2000398934016 bytes 1 heads, 63 sectors/track, 62016336 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/sdb1 63 3907029167 1953514552+ 83 Linux Partition 1 does not end on cylinder boundary.
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