- Change the Default file size to a number somewhat larger than the typical
file size generated by your digital camera. Table 8.1 shows typical files sizes
for digital cameras. Choose the megapixel size of your camera and read
across to find a suggested setting for default file size.
Table 8.1 Average JPEG Default File Sizes for Digital Cameras
Approx. File Size
Average (normal JPEG compression, Enter in
Image Sensor Size Resolution not RAW or TIFF) Default File Size...
1.3 megapixels 1152 × 864 540KB 1474560
2 megapixels 1600 × 1200 600KB 1474560
3.2 megapixels 2048 × 1536 1,100KB 2097152
4 megapixels 2272 × 1704 1,000KB 2097152
5 megapixels 2560 × 1920 1,100KB 4194304
6 megapixels 3072 × 2048 3.1MB 6291456
8 megapixels (Sony) 3264 × 2448 2.4MB 4194304- Repeat the steps in the preceding section to
determine whether a partially restored file is
recovered in total. If these steps don’t work,
chances are good that the file was overwrit-
ten by more recent data.
Filesystems at Work: The File
Allocation Table (FAT)
A little knowledge can be a good thing, especially
when it comes to file recovery. This section explains
how Windows stores files.
Every disk or hard disk on a Windows PC uses a
variant of the File Allocation Table (or FAT) to store
files on the hard disk and flash media. A FAT-based
filesystem is built as shown in Figure 8.4.CHAPTER 8 FILE RECOVERY: FINDING “LOST” IMAGES 103Please note that this
table lists approximate file
sizes. Each camera uses different
compression schemes for JPEG
files. Most cameras also enable
you to save files as TIFF files and
RAW files, which creates signifi-
cantly larger file sizes.