DVD+R DL Layer 1 Verify Speeds

[dbminter]

Why does the speed of a Verify on Layer 1 of DVD+R DL's gradually reduce from the highest point it reached at the end of the Layer 0 Verify?  The Write speeds are relatively constant, meaning they go to X speed and generally stay at X speed, with only minor variations.  But, the Verify of Layer 1 always gradually slows down.

 

 

Just curious.    Thanks!

[LIGHTNING UK!]

Because it reads from the middle to the outer edge and then the outer edge to the middle. Assuming the disc is always spinning at a constant speed, the transfer rate increases as you go from the middle of the disc to the outer edge of the disc - the opposite is therefore true when going from the outer edge to the middle.

[dbminter]

Question about BD-R DL's and BD-RE DL's.  Do they read the same way?  With Layer 0 reading to a maximum X speed and then the reading of Layer 1 starting at that X maximum and then the speed gradually decreases?

 

 

I've not had a chance yet to get any DL or XL media. 

[LIGHTNING UK!]

Yup, they do