[mythtv-users] mythtv-users Digest, Vol 117, Issue 12

[Mike Perkins]

On 05/12/12 17:04, Al Heynneman wrote:
> On 12/04/2012 11:27 AM, mythtv-users-request at mythtv.org wrote:
>> There is a minor issue I have: the two old drives have the same geometry, the
>> two new drives do as well, but the old drives have 512-byte sectors, the new
>> ones have 4096-byte sectors. My plan is this:
>>
>> Remove good old drive, mount with new drive in spare host. Rsync files across.
>> Put new drive into MBE slot where good drive was. (Er, fix fstab for new UUIID.)
>>
>> Remove bad old drive, mount into spare host alongside good old drive (same
>> geometry). Use dd_rescue to bit-copy from bad to good. When happy with result
>> remove bad old drive.
>>
>> Put remaining new drive in spare host, rsync from good old drive to new drive.
>> Remove new drive and put into MBE.
>
> With these new generation 4096 byte sector drives, you have to make sure to use
> formatting/partitioning software that will properly "align" cylinder start
> blocks. When I upgraded the drive in my laptop to a new, larger, Western Digital
> drive, it was a whole new learning curve. On Windows, I also needed to install a
> special Intel software driver to handle these new type of drives.
>
> If you don't do this, your drive access and throughput will be REALLY bad.
>
Yup. I had one of those bigger sector drives a while back when I "upgraded" my 
video storage group. Took me some time to work out the correct figures to put 
into fdisk. The two new drives are the same type as the new video disk so that's 
all right. That's why I do the dance I described above, so that I can dd_rescue 
onto the same geometry.

-- 

Mike Perkins