Online retail giant Amazon, based in Seattle, Washington, has quietly upgraded the internal memory of its e-book reader, the Kindle Paperwhite, from the previous two gigabytes of storage to four gigabytes in models manufactured in the last 30 days.

The upgrade in storage, which was first noticed by The Digital Reader, and would result the increase of reader's library on the device from 1,000 books to 2,000. However, older versions of the Kindle Paperwhite that have 2 gigabytes of memory does not have a slot for an external memory card. Although being upgraded, the new 4 gigabyte e-book reader is still part of the second generation of the Paperwhite series.

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The original e-book reader was launched in 2012 and the Paperwhite 2 was released at the end of 2013. The hardware for the two generations were relatively the same as both models had 256 megabytes of random access memory and two gigabytes of storage capacity. The differences of the two models lie in their processors, where the original Paperwhite has 800 megahertz and the second generation is equipped with 1GHZ, Glowlight and the introduction of new software features in the 2013 model such as the Kindle Freetime, for managing a child's allotted reading time, and a vocabulary builder, for learning new words.

Amazon may yet still launch a new model of the Paperwhite in the year alongside new generations of the original Kindle e-reader and other Kindle tablets. The online retailer would probably announce revised models of those devices in September, according to Digital Trends. In September 2013, Amazon announced the Fire HDX and the Kindle Fire HD was introduced in the early September of 2012. The launch of the devices, however, produced no pattern as the 7-inch e-book reader was unavailable until the middle of November and the HDX's 8.9-inch model wasn't available until the mid-December 2013.

TagsAmazon, Kindle, Kindle Paperwhite, Kindle Paperwhite 2, E-book, E-book reader, Upgrade