Reformating Mac HDD to NTFS on Win7 (DISKPART, SELECT 2, CLEAN) fail: "can't find partition"

I tried to reformat a Mac HDD to NTFS, and haven't succeeded--e.g., see title. Thank you.
E. Douglas (Doug) JensenConsultantAsked:
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You dont need to use Diskpart. First format the drive using computer management and then disk management see if you are able to view the disk there

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You first have to select the correct disk, then the correct partition (select disk x, select part x). It would also be simpler just to delete the partition, then create a new one.

With list disk or list partition you can get the disk and partition number so you can leter select the correct one.
E. Douglas (Doug) JensenConsultantAuthor Commented:
Thank you that makes sense. The instructions I was given didn't mention selecting a partition (it has four) but the error message implied that. Win7 can see all four partitions but Disk Manager won't let me do any actions on that drive.
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E. Douglas (Doug) JensenConsultantAuthor Commented:
I can select a partition (I chose 1) but DISKPART operations on that all respond with the error that it can't find the sector. I am clueless, sorry.
E. Douglas (Doug) JensenConsultantAuthor Commented:
Gaurav, Disk Manager sees the drive and the partitions but won't let me do anything except delete a partition, and that action returns an error.
E. Douglas (Doug) JensenConsultantAuthor Commented:
I went back to Disk Manager to tell you the error--and now it doesn't see the drive at all.
Do you know whether the disk itself is fine? I suggest using the manufacturer's diagnostic utility on it to find that out. Besides, those tools also allow you to zero fill or erase the disk, so provided the disk passes the diagnosis you can just use that option to clear all partitions and data from the disk. If it is bad, then there is not much point in trying to make the disk usable under Windows, rather it should be scrapped.

You can find the manufacturer's diagnostic utilities on the UBCD:
E. Douglas (Doug) JensenConsultantAuthor Commented:
I still don't know the correct process to do this (I have two more Mac drives to reformat) but I think I'll be able to do it--I'll revisit the responses from you. Thank you.
E. Douglas (Doug) JensenConsultantAuthor Commented:
Succeeded using DISKPART. Thank you.
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