February 28, 201313 yr Hi everyone, I precleared a 3TB HD and by mistake I let it define a starting sector of 1. Is there someway I could change the starting sector to 1 or do I have to preclear again? I am certain I have seen a similar post but I cannot find it... Thanks in advance for your help.
February 28, 201313 yr I know you can do this, just not sure if it works with 3TB drives (I know it works for < 2.2TB drives):- -C 63 = convert an existing pre-cleared disk to use sector 63 as a starting sector. -C 64 = convert an existing pre-cleared disk to use sector 64 as a starting sector. Direct copy and paste off the preclear help page (E.G. when you run the script with no parameters).
February 28, 201313 yr Hi everyone, I precleared a 3TB HD and by mistake I let it define a starting sector of 1. Is there someway I could change the starting sector to 1 or do I have to preclear again? I am certain I have seen a similar post but I cannot find it... Thanks in advance for your help. A 3TB drive MUST use a GPT partition which starts at sector 1. 63 or 64 are only used for drives < 2.2TB in size with a MBR partitioning scheme. You have nothing to fix.
February 28, 201313 yr Author I know you can do this, just not sure if it works with 3TB drives (I know it works for < 2.2TB drives):- -C 63 = convert an existing pre-cleared disk to use sector 63 as a starting sector. -C 64 = convert an existing pre-cleared disk to use sector 64 as a starting sector. Direct copy and paste off the preclear help page (E.G. when you run the script with no parameters). Thanks, now i remember where I had seen it before... A 3TB drive MUST use a GPT partition which starts at sector 1. 63 or 64 are only used for drives < 2.2TB in size with a MBR partitioning scheme. You have nothing to fix. I didnt know that. I have precleared one more 3TB HD but I did not notice that. Thanks for the info.
February 28, 201313 yr Hi everyone, I precleared a 3TB HD and by mistake I let it define a starting sector of 1. Is there someway I could change the starting sector to 1 or do I have to preclear again? I am certain I have seen a similar post but I cannot find it... Thanks in advance for your help. You did not make a mistake. A "protective" partition is defined to "fool" older utilities that the disk is entirely allocated. That protective partition starts at sector 1. The actual GPT partition unRAID will use starts at a 4k boundary. You do not need to do anything to "fix" it, as it is not a mistake. The "-C" option, if it worked for your disk at all, would only break the partitioning. (I doubt it will allow you to do anything, as it checks for a proper MBR preclear signature first) Joe L.
February 28, 201313 yr If you try to use the -C option on a precleared disk > 2.2TB, you should see this: ========================================================================1.13 == == DISK /dev/sdX IS PRECLEARED with a GPT Protective MBR == Conversion not possible. All GPT partitions are automatically 4k aligned. == ===========================================================================
Archived
This topic is now archived and is closed to further replies.