Is there a maximum size for an internal hard disk ?

I just bought an 2.5" 160 Gb HD to replace my internal 120 Gb. Presently I only tried to mount it as an external disk, but it is recognized as a 128 Gb disk, not a 160 Gb. As it is a pain to change the internal HD, I would like to be sure the disk will be recognized as a 160 Gb before. I called Apple hot line, but they have no information, for them the maximum capacity for a Powerbook G4 12" is 80 Gb as it was never offered a larger size, but already I have a 120 Gb that I mounted myself perfectly working.
Is there a software / firmware limitation of the addressable size of a hard disk on a PowerBook G4 12" ???

I have called Apple several times, I have talked to the Apple Store in KC. Same answer...well it comes in 40-60-80 configs. Not a good answer.
The 12 inch powerbook G4 supports ATA-100 (100Mb/sec) interface. The specs on the Hitachi HD refer to ATA-6, which refers to the higher speed transfer rate of UDMA6.
As I understand the ATA (AT Attachment),PATA (Parrallel ATA), IDE (Integrated Drive Electronics) and UDMA (Ultra Direct Memory Access) are basically used interchangeably to describe the interface (see wikopedia for detail difference of implementation of specs).
Since the Mac OS supports terabystes of HD data, the OS is not a limitation. The limitation is in the motherboard interface and controller for ATA (ATA-100)
The ATA specification is 28-bit addressing with a maximum capacity to address of 137gb - 128gb formated. It is calculated as follows. A bit is either on or off meaning it is binary - or in mathmatical terms base of 2.
2 to the 28th power = 268,435,456 disk sectors to address.
Each sector has blocks of 512 bytes.
268,435,456 * 512 = 137,438,953,472 or 137GB
Once formated the drive capacity for data is 128GB.
This is the same issue as the W98 PCs. An indication Apple is way behind in technology for HD interface and controllers. Very sad!
Now the part I do not understand ATA-6 introduced 48 bit addressing, increasing the limit to 128 PiB (or 144 petabytes). This is much larger than 128GB standard ATA. My assumption here is the Hitachi HD supports ATA-6 however Apple does not support more than standard ATA on the motherboard HD interface and controller. The G4 HD controller I assume does not support Ultra DMA mode 5 compliant (UDMA5). This would mean it does not support the 80-connector cables, only the older 40-connector cables.
Does anyone know if this powerbook supports ATA-100,UDMA5, 80-connector cables?

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