Tom thank you very much for your patient reply. I have a long way to go in understanding the first principles of video format storage and should not waste your time until I have read whatever is readily available on the subject.
I have not read your articles as I rely on the club copy of the IAC magazine and these are somewhat uncertain in their circulation. (Perhaps I should convert one of my birthday or Christmas presents into a personal membership).
Are the articles archived on line? If not then I will have a go at tracking down the club copies.
The light has at least dawned on the basic difference between compression within a frame and compression applied to a group of frames and the need for significant computing power to return the latter to frame by frame data.
I will now see what I can find on the basics of compression and de-compression and research the camcorders you mentioned.
My philosophy on computer upgrades is to stay a little behind the state of the art specifications mainly for reasons of financial economy and my present configuration is as follows. Before investing in a new camcorder it would be reassuring to know that the present kit is up to the task. My editing system is Premier Pro.
Computer Profile Summary
Computer Name: User-f2c486ccfc (in MSHOME) — Main PC
Profile Date: 24 July 2009 11:29:41
Advisor Version: 7.2x
Windows Logon: Administrator
Operating System System Model
Windows XP Professional Service Pack 3 (build 2600) SiS Technology Inc. SiS661FX + SiS964
Enclosure Type: Desktop
Processor a Main Circuit Board b
3.00 gigahertz Intel Pentium 4
16 kilobyte primary memory cache
2048 kilobyte secondary memory cache Board:
http://www.abit.com.tw SG-80 (SiS 661FX-964) V1.0
Bus Clock: 200 megahertz
BIOS: Phoenix Technologies, LTD 6.00 PG 10/26/2005
Drives Memory Modules c,d
550.12 Gigabytes Usable Hard Drive Capacity
431.57 Gigabytes Hard Drive Free Space
LITE-ON DVD SOHD-167T [CD-ROM drive]
LITE-ON DVDRW SOHW-1633S [CD-ROM drive]
HP USB Device [Hard drive] -- drive 2
Maxtor 6L300S0 [Hard drive] (300.07 GB) -- drive 1, s/n L60KZRXH, rev BANC1G10, SMART Status: Healthy
WDC WD2500AAKS-22VSA0 [Hard drive] (250.06 GB) -- drive 0, s/n WD-WMART1762796, rev 01.01B01, SMART Status: Healthy 2048 Megabytes Installed Memory
Slot 'A0' has 1024 MB
Slot 'A1' has 1024 MB
Local Drive Volumes
c: (NTFS on drive 0) 250.06 GB 209.21 GB free
m: (NTFS on drive 1) 10.49 GB 6.94 GB free
n: (NTFS on drive 1) 10.49 GB 8.34 GB free
o: (NTFS on drive 1) 279.09 GB 207.08 GB free
Thanks again
Arthur