Maple Notes

CrossProduct is different using LinearAlgebra and VectorCalculus, or vectors are shown differently. Also, VectorCalculus redefines the +  sign etc.

SSD disk failure

Brand: Kingston

Model: KINGSTON SV300S37A240G

Firmware revision: 527ABBF0

A user password was set using the maximum level, and the disk removed from the system.

When inserted again, the disk would not respond to commands sent to the disk. The system did report the port as in use.

No physical violence and no known static electricity was involved.

Possible explanations:

• Static electricity.
• The small chock while removing and inserting the cables was enough to damage this disk.
• A firmware bug.

 The disk was less than a year old, and had only been used moderately in a secondary system.

I assume that the failure was somehow related to the fact that the password was set or that the disk was removed and inserted.

Folkeskolereformen

Citat fra citat på politiken.dk:

"Det er ikke alt i reformens indhold der bare er skidt, og jeg kan blive så træt af dem der bare skyder det hele ned (uden at give alternativer eller forklare hvorfor folkeskolen var så fantastisk før reformen).´"

Folkeskolen var ikke fantastisk før reformen. Derfor skulle man selvfølgelig have gjort den bedre i stedet for at gøre den dårligere.

Hvis vi siger at man i en tidsenhed lærer børnene 10 procent af hvad det ville være muligt at lære dem på den tid, så ville det have været ganske betydeligt mere effektivt at højne procenten til 15, end at forlange at børnene skal blive længere tid i skolen, ene og alene af hensyn til dem, der kun kan fyre floskler af.

ATA Security feature Set

Note that if a user password is set it may still be possible to unlock the disk using the default master password, which can be 32 characters of ASCII zero.

However, this is not possible if the user password was set using security level "Maximum".

Windows 7 Installation

Installed Windows 7 on one of three disks in a system.

Told the installation program  which partition Windows should be installed on.

The installation program without warning wrote to a file on another disk.

This behavior is part of the Microsoft Windows Extreme Stupidity project.

I will have to remember to make partitions on other disks invisible to Windows before installing Windows 7.

Windows wrote to the MBR of the other disk too.

De middelmådiges ord

Ordene anføres i tilfældig rækkefølge. Listen er ikke udtømmende.

Fokusområder.

Vækst.

Læring.

Faglighed.

Kompetencer.

Substantielt løft.

MBR Boot Manager

We want this:

The entire boot manager program is in the MBR.

The program boots active partition with standard error messages if no key is pressed.

If right Alt is pressed during boot a prompt is printed to the screen.

If 1, 2, 3, or 4 is then pressed, that partition entry is set active, and the entry is booted.

If Esc is pressed in stead the active partition is booted.

If a, b, c, or d is pressed in stead entry no. 1, 2, 3, or 4 is set active, and that partition booted, but a mark is set that at next boot the previous active mark should be  restored.

If a number or letter is pressed, but that partition is not present nothing should be done.

The first version is present. It did not become so advanced, but it works.

SHA1 D0C6339BFF70F80A84912DD481016495B58271E9, 408 bytes.

If right Alt is pressed during boot a prompt "#" is printed to the screen.

If 1, 2, 3, or 4 is then pressed that partition entry is set active, and the entry is booted.

If there is no matching entry or another key is pressed nothing happens.