Since 4GB SD card is hard to find, consider yourself lucky if you need more than 2GB space and you happen to have a device like that. There may be some devices made to support SDHC but did not claim so due to various reasons back then. The previous Express version used the card without prompting or searching for it, thats new in the 7.8.1.0 version. Ive had an 8GB card in my Nuvi 255W for some years which has always worked. It prompts to search for a card and fails to find it. You need an SD card to perform free Garmin map updates. The new version advises that the latest map update is large and requires an SD card.
How To Install Free Maps on a Garmin Nüvi 255W Sat Nav. Note: The 255W sat nav device I used, can’t handle multiple free maps on the SD card and the map file shouldn’t be renamed. It is important that the G in Garmin is a capital G. For older models such as the Nuvi 255W, you connect the GPS to your computer with a USB cable to perform the updates. Create a directory called Garmin on the sd card and then move the gmapsupp.img file to that folder. However, it would not recognize a "4GB SDHC" memory cards even it is within the size limit of SD. Garmin updates and downloads are usually handled through the companys Garmin Express software for Windows or Mac. Therefore, if a device is designed "SD" only (no SDHC), it will recognize SD memory card only.
The newest "SDXC" is under the same rule, devices supporting SDXC will recognize SD, SDHC, and SDXC cards (max to 2TB). You can use either SD or SDHC card in that device.ģ. Device marked "SDHC" recognizes SD and SDHC (max to 32GB) memory cards. Rarely seen 4GB SD cards, max is usually 2GB.Ģ. That is the max media size SD standard had defined back then.
Older device marked "SD" only recognizes memory cards up to 4GB.