does hdd 7200rpm requires enclosure with additional power supply?

Hi!

I'm going to replace my 7200rpm hdd in my laptop and I want to put my old hdd into enlclosure.. I've seen once 2.5" pocket drive without power cord, usb was enough to power the drive.
On the other hand I have one 3.5" at home with additional power supply..

So my question is does 2.5" hdd 7200rpm requires enclosure with additional power supply?

 

I do not believe so.

 

No additional power required.

 

It depends on its power consumption. Sometimes, manufacture use a "dual head" usb cable to get power from 2 usb ports so 7200RPM would run reliably

 

Generally, 2.5" drives can run off of USB power, while 3.5" drives will require external power.

 

Agree with using at least the double cable
I have had issues with some power jacks not supplying enough current and warnings showing up in windows saying usb device not recognized

Alex

 

No need for additional power, USB is enough, as above said 2 might be required.

 

thank you all!

I'm looking for something now.. I found cheap 2.5 enclosures from HK mostly.. like that one

http://cgi.ebay.com.au/IDE-SATA-2-5-USB2-0-Enclosure-Hard-Drive-HDD-Case-Blk_W0QQitemZ260400072680QQcmdZViewItemQQptZAU_Computers_Storage_Accessories?hash=item260400072680&_trksid=p3286.c0.m14&_trkparms=66%3A2|65%3A1|39%3A1|240%3A1318

but from the picture I can't figure it out how would it work with ATA, there is no connection with usb port.. or I do I miss something?

 

IDE should still connect to the USB port; it probably connects underneath.

 

Hitachi 7K100 SATA drives will not power up on a single USB port. It requires more power than a single USB can provide. You need at least two usb ports to power it. Other than that, every other 2.5" 7200rpm drive is very power efficient, so they will power up on USB.

K-TRON

 

how about some numbers......

A USB port is generally able to supply 500ma of +5 vdc power. If your drive WITH the adapter/controller (usb to sata/pata) needs more than that at startup or running, it WILL NOT work on a single USB port.

Strictly speaking, a fully-spec'd USB port should be able to supply 1 amp of +5 vdc. However (there is *always* a however), available amperage from the USB ports are negotiated just like data speeds. A USB port will nominally supply 100ma, usually just enough for a device to wake up. After the device wakes up, it may then request 500ma or a full 1 amp. The device also negotiates power-saving settings so that the laptop doesn't shut off an external hard drive 'just for fun' or leaves an cabled laser mouse powered up all the time.

Anyway, the USB controller listens for the power request handshake and if all is well, will grant the request BEFORE the external device goes into full-power mode. No negotiation, no extra power.

Some USB ports will start out delivering 500ma of power 'just because'. Those ports are out of spec with the overall USB specification so relying on a pair of ports to hand out 500ma each to gang-power a 1 amp external device is pretty chancy.

This is the why behind the idea of using a double headed USB cable to power an external enclosure.

Caution: A lot of laptop mobos are not capable of supplying max current to multiple USB ports. Even more laptops do not like to have their USB ports short-circuited together which is essentially what that double headed USB cable is doing. The end result can range from your external device not powering up to the laptop toasting-out.

Warning: Remember where the power comes from for your USB ports. It comes from the battery. Expect on-battery run time to be a lot less when powering devices like this.

 

Haha, and also, try to avoid plugging in two USB powered hard drives into the same laptop to copy data from one to the other, because they might both spin up, but when under load there might not be enough power available.

 

If you want to use hitachi drive, you might get a better value by just buying a hitachi external 2.5" drive. 320GB for $85USD, free shipping to anywhere around the world.
http://www.dealextreme.com/details.dx/sku.14586

Using a 7200RPM drive in a usb enclosure doesn't make sense unless you have a spare 7200RPM hdd. You'll not get any speed improvement by using a 7200RPM hdd compared to a 5400RPM hdd.

Something like this
http://www.dealextreme.com/details.dx/sku.11705
would power up 7200RPM since it has dual head usb and a dc input if there's not enough power.

This enclosure has both Esata and USB
http://www.dealextreme.com/details.dx/sku.11704

 

OP is going to take 7200RPM hard drive out of laptop and put into enclosure.

 

that's right, I just needed to put my old 7200 into something..

thanks for the input!

finally I've bought
Wiretek USB 2.0 external 2.5" IDE / PATA HDD enclosure
for AU8.00 plus shipping

 

Seems like you are sure you have a IDE HDD. Didin't mention it anywhere.

 

not always

 

I've mentioned that indirectly..

 

it depends on the drive. sometimes YES they need a power supply. this is, one USB port is not enough to provide enclosure + hdd the power they need (and I'm talking about high power usb2.0). that's why many enclosures comes with a double usb input cable, to provide more power. (1data and power + 1 power only)
for example if you use an usb hub and just 1 usb port you won't get the energy the hdd needs and it won't work (maybe in windows it will say it won't recognize).
7200 hdd's often consume more energy then traditional 5200 ones. but it all depends on the hdd + enclosure power consumption. you may not need an additional power source.
don't forget enclosures also consume energy, specially if they have some fans or lot's of leds etc.