title: Raspberry Pi red light
body: <p>I have a Raspberry Pi B+ connected to an external USB disk, a Seagate Portable 1 Tb (no external power source).</p>
  
  <p>Everything is working fine, but when the disk is writing/reading data, the red light (power) blinks, sometimes. But I don't have any power loss, or corrupted data.</p>
  
  <p>I've tested with 3 different power sources:</p>
  
  <p>1) a generic one, that blinks (5V 3A)</p>
  
  <p>2) my original charger from Galaxy S4 (5V 2A) does the same</p>
  
  <p>3) a Galaxy Tab 3 charger (5V 2A) the red light keeps always off</p>
  
  <p>Since the original Samsung chargers are trustable, I believe that my external HD is using too much power? But if this is true, why Raspberry keeps on and I got no corrupted data?</p>
  
  <p>The red light blinking but everything working fine is a real problem? Or can damage it in some weeks or months? Maybe I need consider stop using an external disk?</p>
  
  <p>Thank you.</p>