4k sector drives
Quoted 3 lines
shows a jumper exists for "advanced format", but doesn't tell what it does. I'll try to set or unset it depending on what it is now, and see if there's a difference.
No, don't set the jumper.
Because DOS required the first head to be empty for some reason and because allmost every geometry uses 63 sectors per track, the first partition usually starts at sector 63. The jumper tells the disk firmware to use a mapping so that the sectors fall in a 4096 boundary. (It uses either +1 or -7 offset). So, the OS thinks it writes to sector 63 while it truly writes to sector 64 (or 56). Every sector is transparently mapped using this offset.
This jumper exists to be used only with legacy OSes like Windows XP and makes sense when there is only one primary partition which covers the whole disk.
So, don't use the jumper in linux but align properly the partitions. fdisk from util-linux-ng > 0.17 align on 1MB so everything will be fine. If you use an older version then align the partitions manually.
WD EARS drives with 00Y model revision doesn't report the sector size properly and only report 512 bytes. (Use hdparm to see it) Those with 00Z revision report correctly that they have 4096 physical sector size and 512 logical sector size.
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Quoted 1 line · On Mittwoch, 21. Juli 2010 Khelben Blackstaff wrote:
No, don't set the jumper.
OK, luckily I didn't have time until now :-)
Quoted 4 lines
WD EARS drives with 00Y model revision doesn't report the sector size properly and only report 512 bytes. (Use hdparm to see it) Those with 00Z revision report correctly that they have 4096 physical sector size and 512 logical sector size.
I have these:
Model=WDC WD20EARS-00MVWB0, FwRev=50.0AB50, SerialNo=WD-WMAZ20035646 Model=WDC WD20EARS-00MVWB0, FwRev=50.0AB50, SerialNo=WD-WMAZ20028252
Any chance to get Linux know they are 4k sector drives manually?
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Le Wed, 21 Jul 2010 11:14:15 +0200
Michael Monnerie <[email protected]> écrivait:
Quoted 5 lines
I have these:
Model=WDC WD20EARS-00MVWB0, FwRev=50.0AB50, SerialNo=WD-WMAZ20035646 Model=WDC WD20EARS-00MVWB0, FwRev=50.0AB50, SerialNo=WD-WMAZ20028252Any chance to get Linux know they are 4k sector drives manually?
From what I've read here and there, apparently they'll always present 512 bytes blocks, bu the system is somehow aware that the underlying block is 4K large, apparently. It isn't very clear...
BTW, I suppose that with such a drive, it's highly commendable to use 4K FS blocks (or larger) instead of the common 1K ones...
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