Here is a list of the serial numbers and sizes of Nand Flash Memory chips currently offered by Samsung and Hynix as displayed on their web sites.
Samsung
K9F1G08R0A (1GigaBit) = 128MB
K9F1G08U0A (1GigaBit) = 128MB
K9K2G08R0A (2GigaBit) = 256MB
K9F2G08R0A (2GigaBit) = 256MB
K9F2G08U0A (2GigaBit) = 256MB
K9K2G08U1A (2GigaBit) = 256MB
K9K2G08U0A (2GigaBit) = 256MB
K9F2G08U0M (2GigaBit) = 256MB
K9F4G08U0A (4GigaBit) = 512MB
K9K4G08U1M (4GigaBit) = 512MB
K9K4G08U0M (4GigaBit) = 512MB
K9F4G08U0M (4GigaBit) = 512MB
K9K8G08U1A (8GigaBit) = 1GB
K9K8G08U0A (8GigaBit) = 1GB
K9K8G08U1M (8GigaBit) = 1GB
K9K8G08U0M (8GigaBit) = 1GB
K9W8G08U1M (8GigaBit) = 1GB
K9L8G08U0M (8GigaBit) = 1GB
K9WAG08U1A (16GigaBit) = 2GB
K9WAG08U1M (16GigaBit) = 2GB
K9NBG08U5A (32GigaBit = 4GB)
K9NBG08U5M (32GigaBit = 4GB)
Hynix
HY27UF081G2A (1GigaBit) = 128MB
HY27UF161G2A (1GigaBit) = 128MB
HY27UFO81G2M (1GigaBit) = 128MB
HY27USO8281A (1GigaBit) = 128MB
HY27UF082G2A (2GigaBit) = 256MB
HY27USO8561A (2GigaBit) = 256MB
HY27UF162G2A (2GigaBit) = 256MB
HY27UF082G2M (2GigaBit) = 256MB
HY27UF084G2M (4GigaBit) = 512MB
HY27USO8121A (4GigaBit) = 512MB
HY27UG088G5M (8GigaBit) = 1GB
HY27UG088GDM (8GigaBit) = 1GB
HY27UFO81G2A (8GigaBit) = 1GB
HY27UFO61G2A (8GigaBit) = 1GB
HY27UH08AG5M (16GigaBit) = 2GB
HY27UH08AGDM (16GigaBit) = 2GB
Not all serials are listed but the following will apply to all chips:
On Samsung chips the 4th & 5th characters denote the memory denstiy as follows:
K9X
1GXXXXX = 1 Gigabit or 128MB
K9X
2GXXXXX = 2 Gigabit or 256MB
K9X
4GXXXXX = 4 Gigabit or 512MB
K9X
8GXXXXX = 8 Gigabit or 1GB
K9X
AGXXXXX = 16 Gigabit or 2GB
K9X
BGXXXXX = 32 Gigabit or 4GB
On Hynix Chips the 9th and 10th characters denote the memory density as follows:
HYXXXXXX
1GXX = 1 Gigabit or 128MB
HYXXXXXX
2GXX = 2 Gigabit or 256MB
HYXXXXXX
4GXX = 4 Gigabit or 512MB
HYXXXXXX
8GXX = 8 Gigabit or 1GB
HYXXXXXX
AGXX = 16 Gigabit or 2GB
HYXXXXXX
BGXX = 32 Gigabit or 4GB