scanner query

[ll-newbie]

Two scanners I am looking at to buy

both have 2400 x 4800 optical resolution. Both have energy star power saver icon. Other specs are very similar. tho one has capability of doing slides and negatives which is nice but not necessarily a purchasing decision factor.

Sensor type: CIS and CCD what if any is the difference and which would be better.

I do a lot of scanning of books, magazines, newspaper articles & pics, old and new photos.

Power source: one has external adaptor and the other does not. It gets power supplied by USB port on PC. What are the pros and cons of these two different types of power source.

the one with the adaptor to scan slides is the one with the external adaptor.

can anyone give me some tips.
thanks

[Chewy]

the power available thru the usb interface is shared with all devices connected by usb,
a scanner will use almost all the 200milliamps available, the only way I would have the usb powered one is if I was using a laptop and size was important, and I wouldn't have any other usb devices connected

[ll-newbie]

Chewy,

that is exactly the information I was looking for. I shall endeavour to go with the one with the adaptor.

many thanks.