While USB 2.0 works fine, we recommend 3.0, 3.1 or 3.2, which cost no more than old 2.0 drives. Temperatures can easily reach 150° F, but you can use Tesla’s Cabin Overheat Protection feature to keep the temperatures below 105° F or so if you elect to use a drive without a high-temperature rating. At the high end, only micro SD cards are suitable for high temperatures often encountered in parked cars in the summer. Only micro SD drives are rated to work below freezing but we expect most drives to work fine, even below freezing as the drives do heat up when in use. The temperature range is the operating temperature. Drives may also slow down as they near filling up. The cheapest drives often show the most dramatic slowdowns during continuous writes. There is a lot of variances with different products. We’ve seen drives rated for 50 MB/s that drop down to 3 MB/s in as little as 5 minutes, while a high-quality drive may only drop the continuous speed by a small amount no matter how long writing occurs. Drives are often only rated at a peak write speed, but with continuous writes, such as four channels of dashcam video, the speed slows down once the tiny RAM cache in the drive fills up. We recommend 20 MB/s or higher, and perhaps a lot higher. To write four 720p video files, the drive must handle 16 MB/s or better. A larger drive allows more storage before the oldest files are lost. Sentry mode can also fill the drive, at which point it overwrites the oldest saved videos. Generally, the larger the drive the longer it lasts. Larger is better, and 32 GB should be the lower limit. Your flash drive must have enough capacity, performance, and the ability to handle a range of environments for proper dashcam operation.
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