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Re: Beating a dead horse

On 11/24/15 00:01, Felix Deichmann wrote:
2015-11-23 18:11 GMT+01:00 William A. Mahaffey III <>:
[his alignment]

Partitions aligned to 2048 sector boundaries, offset 2048 <------ *DING DING
DING* !!!!

[your alignment]

Partitions aligned to 16065 sector boundaries, offset 63 <----- *DING DING
DING* !!!!
My first thought when reading this was that you could have an
"Advanced Format" disk with 4K sectors (as you have 1 TB 2.5" drives,
especially then this can be the case!), but your alignment at a first
look seems horribly wrong for such a disk, which would lead to your
"slow I/O"...
Can you investigate this further? And what is the exact disk model you use?
Apart from that, there are in fact tools which can correct this
misalignment (but always make a backup before :)). Most drive
manufacturers offer a free version of an Acronis tool for their


atactl identifies the drives as:

4256EE1 # atactl  wd0 identify
Model: HGST HTS721010A9E630, Rev: JB0OA3J0, Serial #: JR10046P1D5UXN
World Wide Name: 5000CCA7DCD3A1DD
Device type: ATA, fixed
Capacity 1000 Gbytes, 1953525168 sectors, 512 bytes/sector
Cylinders: 16383, heads: 16, sec/track: 63
Physical sector size: 4096 bytes
First physically aligned sector: 8
Command queue depth: 32
Device capabilities:
        ATA standby timer values
        IORDY operation
        IORDY disabling
Device supports following standards:

Could you expand a bit further on those tools :-) ? Are they NetBSD ported ? CLI tools ? Work on booted/running drives or need to be invoked before/during boot ? Inquiring minds wanna know ;-) ? I will google a bit & see what I can turn up. Thanks & TIA for any further clues ....


	William A. Mahaffey III


	"The M1 Garand is without doubt the finest implement of war
	 ever devised by man."
                           -- Gen. George S. Patton Jr.

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