Are USB-2.0 3.5"/5.25" External Enclosure's self powered?

[biggiesmallz]

Are USB-2.0 3.5"/5.25" External Enclosure's self powered?

Or do they need to be plugged into the wall?

 

[Czar]

3.5 are most often self powered, 5.25 are never self powered

 

[Mday]

Originally posted by: Czar
3.5 are most often self powered, 5.25 are never self powered

um NO. neither are self powered. they use the 12VDC for motor control, are you insane?

2.5" can be self powered because they only use 5VDC, and usb has a 5VDC source. but some are not. they either come with an ac adapter or a 2nd usb cable or a ps2 (keyboard) dongle for the 5VDC power.

3.5" and 5.25" require the 12VDC for motor power, and thus cannot be usb powered. in theory they can be, but the 500mA limit on current prevents it.

i am not aware of the situation with firewire because i am not familiar with their current limiting power conditions.

 

[corkyg]

Originally posted by: Mday

Originally posted by: Czar i am not aware of the situation with firewire because i am not familiar with their current limiting power conditions.

Firewire ports are either 4 or 6 pin. 4-pin require a device with its own power. A 6-pin port will power most Firewire devices. Those that require power, such as scanners and burners, usually have their own power cable for direct A/C/ connection.

 

[Eug]

3.5/5.25" USB 2 and Firewire enclosures are never self-powered.

2.5" USB 2 enclosures can be self-powered. However, they don't always work with higher-power drives (eg. 5400 rpm), due to the limitations of USB 2 power (0.5 A, 5 V = 2.5 Watts)

2.5" 6-pin Firewire enclosures are self-powered and the standard supports enough power to all 2.5" drives, but of course it's up to the maker of the unit providing the port power to make sure it does supply enough power. All Mac laptops will provide enough power. The only PC laptop I've seen so far with 6-pin Firewire is a Gateway. There must be a few others, but they are not common. Usually PCMCIA 6-pin Firewire ports (ie. Firewire on a PC-card) will NOT provide enough power.

2.5" 4-pin Firewire enclosures cannot be self-powered, since 4-pin Firewire carries no power. This is what is found on most PC laptops, esp. Sony and Dell.

 

[biggiesmallz]

Originally posted by: Eug
3.5/5.25" USB 2 and Firewire enclosures are never self-powered.

2.5" USB 2 enclosures can be self-powered. However, they don't always work with higher-power drives (eg. 5400 rpm), due to the limitations of USB 2 power (0.5 A, 5 V = 2.5 Watts)

2.5" 6-pin Firewire enclosures are self-powered and the standard supports enough power to all 2.5" drives, but of course it's up to the maker of the unit providing the port power to make sure it does supply enough power. All Mac laptops will provide enough power. The only PC laptop I've seen so far with 6-pin Firewire is a Gateway. There must be a few others, but they are not common. Usually PCMCIA 6-pin Firewire ports (ie. Firewire on a PC-card) will NOT provide enough power.

2.5" 4-pin Firewire enclosures cannot be self-powered, since 4-pin Firewire carries no power. This is what is found on most PC laptops, esp. Sony and Dell.

Ok can a 2.5" USB 2.0 drive with these specifications be self powered:


Rotational Speed: 5,400rpm


Electrical:

Voltage 5V ±5%


Power Consumption:

Start 5.0W Max.
Seek 2.9W typ
Read/Write 2.5W typ
Sleep 0.1W typ
Energy Consumption Efficiency 0.021W/GB avg



Linky

edit: also is it a good deal at $116 shipped?

Toshiba Super Slimline 40GB Notebook 2.5" Hard Drive

 

[Czar]

Originally posted by: Mday

Originally posted by: Czar
3.5 are most often self powered, 5.25 are never self powered

um NO. neither are self powered. they use the 12VDC for motor control, are you insane?

2.5" can be self powered because they only use 5VDC, and usb has a 5VDC source. but some are not. they either come with an ac adapter or a 2nd usb cable or a ps2 (keyboard) dongle for the 5VDC power.

3.5" and 5.25" require the 12VDC for motor power, and thus cannot be usb powered. in theory they can be, but the 500mA limit on current prevents it.

i am not aware of the situation with firewire because i am not familiar with their current limiting power conditions.

right 😛 confused 3.5 with 2.5 and 5.25 with 3.5😱

 

[biggiesmallz]

Originally posted by: biggiesmallz

Originally posted by: Eug
3.5/5.25" USB 2 and Firewire enclosures are never self-powered.

2.5" USB 2 enclosures can be self-powered. However, they don't always work with higher-power drives (eg. 5400 rpm), due to the limitations of USB 2 power (0.5 A, 5 V = 2.5 Watts)

2.5" 6-pin Firewire enclosures are self-powered and the standard supports enough power to all 2.5" drives, but of course it's up to the maker of the unit providing the port power to make sure it does supply enough power. All Mac laptops will provide enough power. The only PC laptop I've seen so far with 6-pin Firewire is a Gateway. There must be a few others, but they are not common. Usually PCMCIA 6-pin Firewire ports (ie. Firewire on a PC-card) will NOT provide enough power.

2.5" 4-pin Firewire enclosures cannot be self-powered, since 4-pin Firewire carries no power. This is what is found on most PC laptops, esp. Sony and Dell.

Ok can a 2.5" USB 2.0 drive with these specifications be self powered:


Rotational Speed: 5,400rpm


Electrical:

Voltage 5V ±5%


Power Consumption:

Start 5.0W Max.
Seek 2.9W typ
Read/Write 2.5W typ
Sleep 0.1W typ
Energy Consumption Efficiency 0.021W/GB avg



Linky

edit: also is it a good deal at $116 shipped?

Toshiba Super Slimline 40GB Notebook 2.5" Hard Drive

Anyone know?

 

[biggiesmallz]

Originally posted by: biggiesmallz

Originally posted by: biggiesmallz

Originally posted by: Eug
3.5/5.25" USB 2 and Firewire enclosures are never self-powered.

2.5" USB 2 enclosures can be self-powered. However, they don't always work with higher-power drives (eg. 5400 rpm), due to the limitations of USB 2 power (0.5 A, 5 V = 2.5 Watts)

2.5" 6-pin Firewire enclosures are self-powered and the standard supports enough power to all 2.5" drives, but of course it's up to the maker of the unit providing the port power to make sure it does supply enough power. All Mac laptops will provide enough power. The only PC laptop I've seen so far with 6-pin Firewire is a Gateway. There must be a few others, but they are not common. Usually PCMCIA 6-pin Firewire ports (ie. Firewire on a PC-card) will NOT provide enough power.

2.5" 4-pin Firewire enclosures cannot be self-powered, since 4-pin Firewire carries no power. This is what is found on most PC laptops, esp. Sony and Dell.

Ok can a 2.5" USB 2.0 drive with these specifications be self powered:


Rotational Speed: 5,400rpm


Electrical:

Voltage 5V ±5%


Power Consumption:

Start 5.0W Max.
Seek 2.9W typ
Read/Write 2.5W typ
Sleep 0.1W typ
Energy Consumption Efficiency 0.021W/GB avg



Linky

edit: also is it a good deal at $116 shipped?

Toshiba Super Slimline 40GB Notebook 2.5" Hard Drive

Anyone know?

Anyone?

 

[zzzz]

I have the same drive in firewire enclosure and it can be powered by the 6pin firewire port. and thats a good deal.

 

[corkyg]

Yes, it can be. But maybe no, it should not be. For best reliability use the drive housing's power module.