The uMMC Data Storage Module is 2 inches by 1.25 inches (5.08cm by 3.18cm).

Short answer: up to 8KBytes/second.

Long answer:

Writing speeds will vary widely depending on the type of make/model card you're using. There are a lot of different factors that can affect the speed of the card.

To maximize the throughput to the card, try following these guidelines:

Yes. You can find the chipset pricing for the uMMC/uMP3 on the product information page. You can also find information on integrating the chipset under the download section of the product information page.

The uMMC/uMP3 hardware uses a LDO (Low Drop-Out) voltage regulator. You can use 3.0V or 3.3V as the input voltage, but you need to ensure that the serial lines do not exceed the supply voltage (3.0V or 3.3V respectively).

For file creation, the uMMC/uMP3 only accepts the 8.3 filename format.
e.g. FILENAME.EXT

The uMMC/uMP3 does, however, accept long filenames for reading.

EF2 happens when the file in the path does not exist.
e.g. Opening a file for reading that does not exist.

EF5 is essentially the same as EF2, but something in the middle of the path does not exist.
e.g. /DIR1/BADDIR/LOG/FILE.TXT - where BADDIR does not exist.

EE7 occurs when you open a file, but the path specifies a directory.

The manual states the maximum consumption based on SD/MMC card standards.

Here is our measurements for a Lexar 64MB MMC card. Current measurements may vary with different cards.

uMMC Power Consumption

@5.0V  nominal  maximum
idle   8.5 mA   15.0 mA
read   15.0 mA  30.0 mA
write  40.0 mA  60.0 mA

The life span for a uMMC/uMP3 unit is only limited by the contact wear on the MMC card connector - which is rated at up to 12,000 plug-in cycles.