Can't burn cd's

and sometimes my cd drive dissapears

here is my log

Windows XP 5.1
IA32
WinAspi: -
ahead WinASPI: File 'C:\Program Files\Ahead\nero\Wnaspi32.dll': Ver=2.0.1.74, size=164112 bytes, created 26/10/2004 6:35:34 PM
Nero Version: 6.6.0.16
Internal Version: 6, 6, 0, 16b
(Nero Express)
Recorder: <LITE-ON CD-RW SOHR-4839V>Version: 1G$1 - HA 3 TA 0 - 6.6.0.16
Adapter driver: <atapi> HA 3
Drive buffer : 1536kB
Bus Type : default (0) -> ATAPI, detected: ATAPI
CD-ROM: <LITE-ON CD-RW SOHR-4839V>Version: 1G$1 - HA 3 TA 0 - 6.6.0.16
Adapter driver: <atapi> HA 3

=== Scsi-Device-Map ===
DiskPeripheral : WDC WD800BB-22JHC0 atapi Port 0 ID 0 DMA: On
CdRomPeripheral : LITE-ON CD-RW SOHR-4839V atapi Port 3 ID 0 DMA: On

=== CDRom-Device-Map ===
LITE-ON CD-RW SOHR-4839V E: CDRom0
=======================

AutoRun : 1
Excluded drive IDs:
WriteBufferSize: 38797312 (0) Byte
ShowDrvBufStat : 0
BUFE : 0
Physical memory : 238MB (244464kB)
Free physical memory: 80MB (82132kB)
Memory in use : 66
Uncached PFiles: 0x0
Use Inquiry : 1
Global Bus Type: default (0)
Check supported media : Disabled (0)

4.10.2005
CD-ROM (ISO)
4:58:21 PM #1 Text 0 File Isodoc.cpp, Line 6356
Iso document burn settings
------------------------------------------
Determine maximum speed : FALSE
Simulate : FALSE
Write : TRUE
Finalize CD : TRUE
Multisession : FALSE
Burning mode : TAO
Mode : 1
ISO Level : 1 (Max. of 11 = 8 + 3 char)
Character set : ISO 9660
Joliet : TRUE
Allow pathdepth more than 8 directories : TRUE
Allow more than 255 characters in path : TRUE
Write ISO9660 ;1 file extensions : TRUE

4:58:21 PM #2 Text 0 File Burncd.cpp, Line 2948
LITE-ON CD-RW SOHR-4839V
Buffer underrun protection activated

4:58:21 PM #3 Text 0 File Reader.cpp, Line 127
Reader running

4:58:21 PM #4 Text 0 File Writer.cpp, Line 122
Writer LITE-ON CD-RW SOHR-4839V running

4:58:21 PM #5 ISO9660GEN -11 File geniso.cpp, Line 3309
First writeable address = 0 (0x00000000)

4:58:22 PM #6 Text 0 File Burncd.cpp, Line 3233
Turn on Track-At-Once, using CD-R/RW media

4:58:22 PM #7 Text 0 File DlgWaitCD.cpp, Line 270
Last possible write address on media: 359844 ( 79:59.69)
Last address to be written: 201462 ( 44:48.12)

4:58:22 PM #8 Text 0 File DlgWaitCD.cpp, Line 282
Write in overburning mode: NO (enabled: CD)

4:58:22 PM #9 Text 0 File DlgWaitCD.cpp, Line 2483
Recorder: LITE-ON CD-RW SOHR-4839V;
CDR code: 00 97 15 17; OSJ entry from: Ritek Co.
ATIP Data:
Special Info [hex] 1: C0 00 90, 2: 61 0F 11 (LI 97:15.17), 3: 4F 3B 46 (LO 79:59.70)
Additional Info [hex] 1: 00 00 80 (invalid), 2: 00 80 00 (invalid), 3: 00 80 80 (invalid)

4:58:22 PM #10 Text 0 File DlgWaitCD.cpp, Line 448
>>> Protocol of DlgWaitCD activities: <<<
=========================================

4:58:22 PM #11 Text 0 File ThreadedTransferInterface.cpp, Line 838
Setup items (after recorder preparation)
0: TRM_DATA_MODE1 ()
2 indices, index0 (150) not provided
original disc pos #0 + 201463 (201463) = #201463/44:46.13
relocatable, disc pos for caching/writing not required/ required, no patch infos
-> TRM_DATA_MODE1, 2048, config 0, wanted index0 0 blocks, length 201461 blocks [LITE-ON CD-RW SOHR-4839V]
--------------------------------------------------------------

4:58:22 PM #12 Text 0 File ThreadedTransferInterface.cpp, Line 1051
Prepare recorder [LITE-ON CD-RW SOHR-4839V] for write in TAO
DAO infos:
==========
MCN: ""
TOCType: 0x00; Session Closed, disc fixated
Tracks 1 to 1:
1: TRM_DATA_MODE1, 2048/0x00, FilePos 0 307200 412903424, ISRC ""
DAO layout:
===========
__Start_|____Track_|_Idx_|_CtrlAdr_|_RecDep__________
-150 | lead-in | 0 | 0x41 | 0x00
-150 | 1 | 0 | 0x41 | 0x00
0 | 1 | 1 | 0x41 | 0x00
201463 | lead-out | 1 | 0x41 | 0x00

4:58:22 PM #13 Text 0 File ThreadedTransferInterface.cpp, Line 1119
Removed 2 run-out blocks from end of track 1. Length: 201463 -> 201461.

4:58:23 PM #14 Phase 24 File dlgbrnst.cpp, Line 1832
Caching of files started

4:58:24 PM #15 Text 0 File Burncd.cpp, Line 4120
Cache writing successful.

4:58:24 PM #16 Phase 25 File dlgbrnst.cpp, Line 1832
Caching of files completed

4:58:24 PM #17 Phase 36 File dlgbrnst.cpp, Line 1832
Burn process started at 48x (7,200 KB/s)

4:58:24 PM #18 Text 0 File ThreadedTransferInterface.cpp, Line 2654
Verifying disc position of item 0 (relocatable, disc pos, no patch infos, orig at #0): write at #0

4:58:24 PM #19 Text 0 File Mmc.cpp, Line 21708
Set BUFE: Buffer underrun protection -> ON , SMART-BURN : ON

4:59:59 PM #20 SCSI -1106 File Cdrdrv.cpp, Line 1434
SCSI Exec, HA 3, TA 0, LUN 0, buffer 0x06B10000
Status: 0x04 (0x01, SCSI_ERR)
HA-Status 0x00 (0x00, OK)
TA-Status 0x02 (0x01, SCSI_TASTATUS_CHKCOND)
Sense Key: 0x03 (KEY_MEDIUM_ERROR)
Sense Code: 0x73
Sense Qual: 0x03
CDB Data: 0x2A 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x20 0x00 0x00 0x00
Sense Data: 0x70 0x00 0x03 0x00 0x00 0x00 0x00 0x0A
0x00 0x00 0x00 0x00 0x73 0x03

4:59:59 PM #21 CDR -1106 File Writer.cpp, Line 311
Power calibration error

4:59:59 PM #22 Text 0 File ThreadedTransfer.cpp, Line 228
all writers idle, stopping conversion

4:59:59 PM #23 Text 0 File ThreadedTransfer.cpp, Line 222
conversion idle, stopping reader

4:59:59 PM #24 CDR -201 File WriterStatus.cpp, Line 200
Invalid write state
LITE-ON CD-RW SOHR-4839V\H3 T0

4:59:59 PM #25 TRANSFER -18 File WriterStatus.cpp, Line 200
Could not perform EndTrack

4:59:59 PM #26 Text 0 File Mmc.cpp, Line 16352
<LITE-ON CD-RW SOHR-4839V> start Close Session

4:59:59 PM #27 Phase 38 File dlgbrnst.cpp, Line 1832
Burn process failed at 48x (7,200 KB/s)


Existing drivers:
File 'Drivers\ADPU160M.SYS': Ver=v3.60a (Lab01_N(johnstra).010529-2218), size=101888 bytes, created 17/08/2001 11:07:32 PM
File 'Drivers\PXHELP20.SYS': Ver=2.03.28a, size=20640 bytes, created 11/03/2005 4:28:13 PM (Prassi/Veritas driver for win 2K)
File 'Drivers\atapi.sys': Ver=5.1.2600.2180 (xpsp_sp2_rtm.040803-2158), size=95360 bytes, created 03/08/2004 11:59:44 PM (Adapter driver for rec)

Registry Keys:
HKLM\Software\Microsoft\Windows NT\CurrentVersion\WinLogon\AllocateCDROMs : 0 (Security Option)