Mukii TransImp enclosu HD upside down

I am using a Mukii TransImp enclosure for a 2.5" laptop drive. Other
than the gray lettering, it is identical in appearance to
http://www.dx.com/p/mukii-transimp-t...6#.VAVArGMkirE,
except that mine has an eSATA interface. The left edge of the housing
comes off to reveal a plug-in interface. The problem is that if I lay
the enclosure down flat, the HD is upside down from its orientation in
the laptop. Are current day HDs for laptops impervious to the
orientation, or will this be "problematic" in any way?

wrote

I am using a Mukii TransImp enclosure for a 2.5" laptop drive.
Other than the gray lettering, it is identical in appearance to
http://www.dx.com/p/mukii-transimp-t...6#.VAVArGMkirE,
except that mine has an eSATA interface. The left edge of the housing
comes off to reveal a plug-in interface. The problem is that if I lay
the enclosure down flat, the HD is upside down from its orientation in
the laptop. Are current day HDs for laptops impervious to the
orientation,

The WD and Seagate datasheets don't say anything about it.

Cant find the Toshiba ones.

or will this be "problematic" in any way?

No.

On 09/01/2014 11:07 PM, wrote:
The problem is that if I lay
the enclosure down flat, the HD is upside down from its orientation in
the laptop. Are current day HDs for laptops impervious to the
orientation, or will this be "problematic" in any way?

It has been some time since either desktop drives or laptop drives
have been sensitive to their orientation.

Several years ago someone asked a WD engineer why the installation
instructions at that time stated that the recommended orientations
were "any side down," i.e., any of the 6 right-angle orientations,
wondering why the limitation to those exact orientations. The
engineer responded, "Because that's the way we test them."

--
Bob Nichols AT comcast.net I am "RNichols42"

Rod, Robert,

Thanks for the reassurance of the insensitivity of the HD to the physical orientation. Eery how my basic knowledge is so obsolete. When I was in high school (or was it university?), the heads glided on a film of air. Presumably from the velocity at which the surface of the disk moved.

On 09/02/2014 10:39 PM, wrote:
Eery how my basic knowledge is so obsolete. When I was in high school (or
was it university?), the heads glided on a film of air. Presumably from the
velocity at which the surface of the disk moved.

They still do. That film is just a lot thinner than it used to be.

--
Bob Nichols AT comcast.net I am "RNichols42"

On Wednesday, September 3, 2014 9:31:38 AM UTC-4, Robert Nichols
wrote:
On 09/02/2014 10:39 PM, andymhancockATgmailDOTcom wrote:
Eery how my basic knowledge is so obsolete. When I was in high
school (or was it university?), the heads glided on a film of air.
Presumably from the velocity at which the surface of the disk
moved.

They still do. That film is just a lot thinner than it used to be.

If air is what is keeping the head from landing on the surface, it
means there's vertical freedom of movement. Wouldn't turning it
upside cause the head to fall further away from the surface, thus
weakening the signal detection?

On Wed, 3 Sep 2014 18:41:58 -0700 (PDT), wrote:

On Wednesday, September 3, 2014 9:31:38 AM UTC-4, Robert Nichols
wrote:
On 09/02/2014 10:39 PM, andymhancockATgmailDOTcom wrote:
Eery how my basic knowledge is so obsolete. When I was in high
school (or was it university?), the heads glided on a film of air.
Presumably from the velocity at which the surface of the disk
moved.

They still do. That film is just a lot thinner than it used to be.

If air is what is keeping the head from landing on the surface, it
means there's vertical freedom of movement. Wouldn't turning it
upside cause the head to fall further away from the surface, thus
weakening the signal detection?

Given: a cushion of air keeps the head assembly from touching the platters
when the drive is powered on and the heads aren't parked.

Implied: there's a counteracting force that would cause the head assembly to
drag against the platters if it weren't for that cushion of air.

Your assumption seems to be that gravity is that counteracting force, in
which case turning the drive over would force the mass of the arm and head
assembly to pull the heads away from the platter. But what if the head
assembly is held in place by spring force or a strong magnetic field instead
of gravity?

Disclaimer: I don't know what I'm talking about.

wrote
Robert Nichols wrote
andymhancockATgmailDOTcom wrote

Eery how my basic knowledge is so obsolete. When
I was in high school (or was it university?), the heads
glided on a film of air. Presumably from the velocity
at which the surface of the disk moved.

They still do. That film is just a lot thinner than it used to be.

If air is what is keeping the head from landing on the surface,

No if about it.

it means there's vertical freedom of movement.

Corse there is.

Wouldn't turning it upside cause the head
to fall further away from the surface,

No, because the head is held against the surface
by the metal that the head is mounted on.

thus weakening the signal detection?

No.

Many drives have a head on each side of the platter,
so turning the drive upside down just sees the other
head below the platter and the other one above it.

wrote:
On Wednesday, September 3, 2014 9:31:38 AM UTC-4, Robert Nichols
wrote:
On 09/02/2014 10:39 PM, andymhancockATgmailDOTcom wrote:
Eery how my basic knowledge is so obsolete. When I was in high
school (or was it university?), the heads glided on a film of air.
Presumably from the velocity at which the surface of the disk
moved.

They still do. That film is just a lot thinner than it used to be.

If air is what is keeping the head from landing on the surface, it
means there's vertical freedom of movement. Wouldn't turning it
upside cause the head to fall further away from the surface, thus
weakening the signal detection?

Not at all. With the weigth of the heads and the strength of the
spring used, gravity is not a factor. Also, modern disks regulate
the height the heads are flying in using heat.

If you are really concerned, look at the disk's datasheet.
It will state soemthing like "mounting direction: any".

Arno

Thank you Mark, Rod, & Arno.

It amazes me that a film of air is able to keep the head off the surface despite the fact that a spring is pressing the head against the surface.