Graham, Suppose that you are listening to FM Radio and you need to access something on your SD card. If the Braillenote does not provide power to the card slot, how can you access the information you need? The BN powers the slot in order for the card "to be ready as needed." That is, instant access. HTH, Joseph P.S. The milliamp is meant to be used for USB devices, since the maximum power that a USB device can use is 500 milliamps. I believe SD cards does not use that amount, though.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Graham Stoodley Sent: Saturday, December 30, 2006 6:32 PM To: Braillenote List Subject: Re: [Braillenote] SD card remaining in the slot? Thanks for the explanation, Joseph, but I am still a little confused about why the BN would be powering the SD card if I insert that card but do not use it for any operation. Suppose I am listening to the FM radio with the SD card inserted in the slot. Is the BN still providing its 500 milliamps to the SD card, and if so, what for? ----- Original Message ----- From: "Joseph Lee" <[EMAIL PROTECTED]> To: "Braillenote List" <[email protected]> Sent: Saturday, December 30, 2006 7:17 PM Subject: Re: [Braillenote] SD card remaining in the slot? Graham and list, The following also applies to any PC/CF cards, USB accessories such as thumb drives, hard drives, keyboards, printers, and such, and other connectivity options: Each device uses BrailleNote's power to operate, especially USB devices. When the device is inserted, it presents itself as whatever it is intended for such as network card, USB thumb drive, etc. (the following only applies to USB) When a device is inserted, it uses minimal power. By the permission of Windows CE, it iwithitches to high power mode (same is true with some CF cards). SD cards does not take too much power, although some cards, especially that runs faster than ordinary SD cards, does tend to draw more power. In the following paragraph, I'll use a USB thumb drive as an example: When a thumb drive is inserted, it presents itself as a "hard disk." At this time, it uses less power (100 milliamps to be exact). It then asks BrailleNote if it can use more power. BrailleNote determines the current battery level. If it finds that it has enough power, then it will allow the thumb drive to operate at high power, thus using BrailleNote's memory (500 milliamps). If the BrailleNote finds that it does not have enough power, the follow message is given (slightly modified): "The unit does not have enough battery power to operate this device. Do you still want to use this device?" If you say "yes," BrailleNote is then forced to operate the device with high power. If it is "no," then it disregards its request for more power. A typical device uses 500 milliamps of power. The greater the number, the more power it uses, thus shortening the battery life. I hope this explanation did not sound too techie (if it was, let me know; probably Andy, Mickey or others will be able to answer this one; grin). HTH, Joseph Skype: joslee22590 > ----- Original Message ----- >From: "Graham Stoodley" <[EMAIL PROTECTED] >To: "Braillenote List" <[email protected] >Date sent: Thu, 28 Dec 2006 20:50:00 -0500 >Subject: Re: [Braillenote] SD card remaining in the slot? >I am curious about this issue of leaving one's SD card in the slot of >the BrailleNote. Why should doing so have any effect on battery life >in the BN, since the memory in the SD card is nonvolatile and will >remain undamaged while the SD card is out of the BN. Unless you are >using it, why should having it in the slot of the BN put more of a >strain on its battery? Does anyone have the real answer to this >oft-quoted injunction about battery life and the SD card? >----- Original Message ----- >From: "Brian Lingard" <[EMAIL PROTECTED] >To: "'Braillenote List'" <[email protected] >Sent: Thursday, December 28, 2006 4:05 PM >Subject: RE: [Braillenote] SD card remaining in the slot? >Ottawa Canada >Far as I know, you can leave your card in the slot forever and >the spring will be ok. However you should not leave your card in >the slot when not in use and running on battery power as this >will drain the battery quicker than without the card in place. >They make much better springs these days than they do batteries! >Brian >-- >No virus found in this outgoing message. >Checked by AVG Free Edition. >Version: 7.5.432 / Virus Database: 268.15.29/607 - Release Date: >28/12/2006 12:31 PM >___ >To leave the BrailleNote list, send a blank message to >[EMAIL PROTECTED] >To view the list archives or change your preferences, visit >http://list.humanware.com/mailman/listinfo/br aillenote >___ >To leave the BrailleNote list, send a blank message to >[EMAIL PROTECTED] >To view the list archives or change your preferences, visit >http://list.humanware.com/mailman/listinfo/br aillenote ___ To leave the BrailleNote list, send a blank message to [EMAIL PROTECTED] To view the list archives or change your preferences, visit http://list.humanware.com/mailman/listinfo/braillenote ___ To leave the BrailleNote list, send a blank message to [EMAIL PROTECTED] To view the list archives or change your preferences, visit http://list.humanware.com/mailman/listinfo/braillenote ___ To leave the BrailleNote list, send a blank message to [EMAIL PROTECTED] To view the list archives or change your preferences, visit http://list.humanware.com/mailman/listinfo/braillenote
