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Re: USB hard drives -- recommendations?




On 03.02.2019 23:02, Pascal Hambourg wrote:
Le 03/02/2019 à 11:22, Alexander V. Makartsev a écrit :
On 03.02.2019 15:01, Pascal Hambourg wrote:
Le 03/02/2019 à 10:10, Curt a écrit :
On 2019-02-03, local10 <local10@xxxxxxxxxxxx> wrote:

You may want to consider buying an USB HDD enclosure/cradle, like this
one[1] for example, they are cheap and would allow you to use a
regular internal HDD as a USB drive.

Note that this solution may require an external power supply.

It won't be necessary for 2.5" hard drives. Only 3.5" hard drives
require +12V DC to function, which USB interface can not provide.

Some 2,5" drives require more current than the 500 mA a USB 2.0 host port can provide. Looking at my own, I read 800 mA, 1100 mA, 580 mA, 451 mA. So only one of them is below 500 mA.
Turns out you are right. Modern 2.5" HDDs are made to be more demanding, according to hardware specs available on web sites of WD and Seagate. Only exception are 2.5" L200 series drives from Toshiba. They require <500mA to operate.
Some years ago that wasn't the case, because I still use 250Gb and 120Gb Seagate HDDs with 2.5" USB2.0 disk enclosure, so I assume WD and Seagate did that on purpose to make their external hard drive enclosures viable. *sigh*

I think it won't be cost-effective to make an
entirely new custom PCB for a hard drive that will have both SATA and
USB controllers on-board.

The PCB can be the same, but it can be equipped with only the controller, PHY and connector required for the destination.
No need for an adapter PCB, controller and connectors in the enclosure. Less parts = less assembly cost.

Can you name a make\model, so I can avoid and don't recommend them, because this alone makes them a solid no-no, because if / once they fail you won't be able to recover data from them without specialized data recovery hardware.

-- 
With kindest regards, Alexander.

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